diff --git a/core/Dockerfile b/core/Dockerfile
index 56edd1e..234b88b 100644
--- a/core/Dockerfile
+++ b/core/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.3-labs
+# syntax=docker.io/docker/dockerfile:1.5.2
 FROM ubuntu:20.04
 RUN <<EOF
 export DEBIAN_FRONTEND=noninteractive 
@@ -19,10 +19,13 @@ EOF
 # use envsubst in entrypoint script to convert config templates to actual config files
 COPY --chmod=0775 entrypoint.sh /entrypoint.sh
 # https://documentation.kopano.io/kopanocore_administrator_manual/configure_kc_components.html#configure-kopano-dagent-for-delivery-via-unix-socket
-EXPOSE 236     # mapi (client-server)
-EXPOSE 237     # tls_mapi (server-server)
-EXPOSE 2003    # lmtp (dagent)
+# mapi (client-server)
+#EXPOSE 236
+# tls_mapi (server-server)
+#EXPOSE 237
+# lmtp (dagent)
+#EXPOSE 2003
 VOLUME /etc/kopano
 VOLUME /var/lib/kopano/attachments
 ENTRYPOINT ["/entrypoint.sh"]
-CMD ["/usr/sbin/kopano-server"]
+CMD ["bash"]
diff --git a/docker-compose.yml b/docker-compose.yml
index a574e24..d741798 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,12 +5,14 @@ services:
     image: core
     depends_on:
       - mysql
+    ports:
+      - 236:236
     volumes:
       - attachments:/var/lib/kopano/attachments
       - ./etc-zntrl/kopano:/etc/kopano:ro
-      # - ./etc-zntrl/ssl:/etc/ssl:ro
     command: /usr/sbin/kopano-server
   spooler:
+    build: ./core
     image: core
     depends_on:
       - server
@@ -77,7 +79,7 @@ services:
       - 8025:25
     volumes:
       - spool:/var/spool/postfix
-      - ./etc-zntrl/postfix:/etc/postfix:ro
+      # - ./etc-zntrl/postfix:/etc/postfix
 networks:
   traefik:
     external: true
diff --git a/etc-zntrl/kopano/dagent.cfg b/etc-zntrl/kopano/dagent.cfg
index d02a268..f61d751 100644
--- a/etc-zntrl/kopano/dagent.cfg
+++ b/etc-zntrl/kopano/dagent.cfg
@@ -15,7 +15,7 @@ lmtp_listen = *:2003
 #server_socket = file:///var/run/kopano/server.sock
 server_socket = https://server:237
 # Login to the storage server using this SSL Key
-sslkey_file = /etc/kopano/ssl/private/kopano.client.key
+sslkey_file = /etc/kopano/ssl/private/system-key-cert.pem
 # The password of the SSL Key
 sslkey_pass = 
 
diff --git a/etc-zntrl/kopano/server.cfg b/etc-zntrl/kopano/server.cfg
index fd8ae73..046a676 100644
--- a/etc-zntrl/kopano/server.cfg
+++ b/etc-zntrl/kopano/server.cfg
@@ -9,9 +9,9 @@
 server_listen = 0.0.0.0:236
 server_listen_tls = 0.0.0.0:237
 # server_ssl_key_file: needs key and certificate
-server_ssl_key_file = /etc/kopano/ssl/private/kopano.server.key
+server_ssl_key_file = /etc/kopano/ssl/private/server-key-cert.pem
 #server_ssl_key_pass =
-server_ssl_ca_file = /etc/kopano/ssl/certs/balusign-signing-ca.pem
+server_ssl_ca_file = /etc/kopano/ssl/certs/balusign-ca-chain.pem
 #server_ssl_ca_path = /etc/kopano/ssl/certs
 #server_tls_min_proto = tls1.2
 # Path of SSL Public keys of clients
@@ -20,7 +20,7 @@ sslkeys_path = /etc/kopano/sslkeys
 # Name for identifying the server in a multi-server environment. Need
 # not be a DNS name, but this name needs to be present on a LDAP
 # kopano-server object's cn value.
-server_name = mail.zntrl.de
+server_name = kopano.server
 # Multi-server
 # enable_distributed_kopano = false
 
@@ -40,7 +40,7 @@ local_admin_users = root kopano
 log_method = auto
 # log_file = /var/log/kopano/server.log
 # Loglevel (0(none), 1(crit), 2(err), 3(warn), 4(notice), 5(info), 6(debug))
-log_level = 9
+log_level = 6
 log_timestamp = yes
 
 # Attachment backend driver type: "database", "files", "files_v2", "s3"
diff --git a/etc-zntrl/kopano/spooler.cfg b/etc-zntrl/kopano/spooler.cfg
index 45fc7d1..c2ff76d 100644
--- a/etc-zntrl/kopano/spooler.cfg
+++ b/etc-zntrl/kopano/spooler.cfg
@@ -8,7 +8,7 @@ smtp_port = 25
 # server_socket = default:
 server_socket = https://server:237
 # Login to the storage server using this SSL Key
-sslkey_file = /etc/kopano/ssl/private/kopano.client.key
+sslkey_file = /etc/kopano/ssl/private/system-key-cert.pem
 # The password of the SSL Key
 sslkey_pass = 
 
diff --git a/etc-zntrl/kopano/ssl/certs/balusign-ca-chain.pem b/etc-zntrl/kopano/ssl/certs/balusign-ca-chain.pem
new file mode 100644
index 0000000..10c08d7
--- /dev/null
+++ b/etc-zntrl/kopano/ssl/certs/balusign-ca-chain.pem
@@ -0,0 +1,106 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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diff --git a/etc-zntrl/kopano/ssl/certs/balusign-signing-ca.pem b/etc-zntrl/kopano/ssl/certs/balusign-signing-ca.pem
deleted file mode 100644
index e438244..0000000
--- a/etc-zntrl/kopano/ssl/certs/balusign-signing-ca.pem
+++ /dev/null
@@ -1,70 +0,0 @@
------BEGIN CERTIFICATE-----
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-
diff --git a/etc-zntrl/kopano/ssl/kopano.server.chain.crt b/etc-zntrl/kopano/ssl/kopano.server.chain.crt
deleted file mode 100644
index db92c5a..0000000
--- a/etc-zntrl/kopano/ssl/kopano.server.chain.crt
+++ /dev/null
@@ -1,98 +0,0 @@
------BEGIN CERTIFICATE-----
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------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
diff --git a/etc-zntrl/kopano/ssl/kopano.server.crt b/etc-zntrl/kopano/ssl/kopano.server.crt
deleted file mode 100644
index 60a19bd..0000000
--- a/etc-zntrl/kopano/ssl/kopano.server.crt
+++ /dev/null
@@ -1,29 +0,0 @@
------BEGIN CERTIFICATE-----
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-I/T+oA2AFqoMhtHeo5w5gvb3r1okfiqynCb0JXri8SoDej3a/cPXWu3wKgLXsavi
-wqOPClCLNYE+1bhsX/hohl3+AoYMTX5wdzeTB7wdO2g6b52Cnp5yS1fKdZu4+1zV
-cmx40mhtjUi3x29xp7x6Z8aUcAQte0roHPrehh72sh7nEALkeq0b0Lg8oJCUD6K2
-XzEjwihM3yVF3pdcGCPkyQTJUypp+cyvlGmQdkJYlljFbmJNQ3g3kIw4tQTZdE5w
-6hLvoY4OjlL0o1ysE8HTaJr/GzG8+rfWl55orVUZrO1nd+r8twcUvEd7VY46hC3x
-qNQojU6DPVt3ie6qT4S0ZxASsa5E5C5ouH+hSWLV7dPhd2HnVlswBxWoJjeTcSLu
-cj9NhBr7HNBCjsh1Gj6Q2uC2Njd+Ea0XgM72LTtYh9EN1FY=
------END CERTIFICATE-----
diff --git a/etc-zntrl/kopano/ssl/private/kopano.client.key b/etc-zntrl/kopano/ssl/private/kopano.client.key
deleted file mode 100644
index 0e13375..0000000
--- a/etc-zntrl/kopano/ssl/private/kopano.client.key
+++ /dev/null
@@ -1,57 +0,0 @@
------BEGIN PRIVATE KEY-----
-MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDMXnuHQqfaQ8qg
-sz6zLTGClWdHaBC5Wro14LROyC9gvFs9bnTnbPCiDAlcgVfTVb4Y6szYpeADVUkc
-OgwQmsVs/kGqe1fO2qKNtn05JLkEQQgOlcVQThL7Zw+Qg1if4FO+kpR3hpQjiM2d
-bwNtkJPxFa+Q/ks7RRyCRXEodsVUR1RKIFwVLz9fXRQKMbBq+lthxHu7XB0T3Qto
-anHXYhHincD+2WwaM32kAYQ5+hKRIM5OCoiTX3+kYTFCrSFqCKOoprMN8dZx0Zj8
-RjE2kf5uBF/VSTmM/TZAUYjVQ7NTWaQnBnUCC4Sg6LDr0KT5x7HRBPvWCHvoLY1T
-+iow+lZJAgMBAAECggEAVa1qlisgmYWAJlze9VkF/5vI/4umLz7VAA9jKAAOtLxi
-d9+dzQPD4fuv1QM4oZW5q1KMbGsl/d+8VcQUGMX57JavStyI1GSeb1DJMLKvihQF
-X6/0V5VTqefsA4a9GdF+6k8jRPS7mCYbJVxMEJvjGdggkWW6fm+b4xVfujoIwiqg
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-tHBXZm+Jhs1c6QY+IYhwRKP0eu4gyyCH/urXjGPpq22PwBJkFgFpmbXcK8Qwwf5h
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-AeKjZ3fGUxc0bjHD31zA9I5uR8Ja2hI8qZ7TjwNv3smPEck8MQ3p3X8IMI/pNpkD
-fCI9fqFUQQKBgCZwheR1tXCyWldNAjy6UTJ7N1yTFiz6NS+1KZKB9aI4pbMvCnEl
-fe+IsRzOb0fJ3QM3Yp0MB8zi8or77jrhkTtfoncIIjEHa1MfHHrUOWm2hrXYHNeQ
-BSldVb8T4qrzjgRJ767Ihqru4z0XCXTufDPR75Y55U84gV7d1hPOfJ6JAoGBAJoW
-nG0cAMZrFzAPSwl5Tc8UHViYOYELBheZwJNMtRtXA+jxBT/b4sY5qcKrpQlOY/ga
-o9zJ8BpDlmgT9FOsaryyy65HzxMPMhwkmi3pzhTuPNDseYsj1ueZ3OfHkmEBpg7E
-RZmn24+eM0fSYZJP/tnCYoq6lrbjCESyIlZzC8pBAoGAU4MO1A3Yfm4eZkN+V+8y
-UPMnYNXtH/BKkwSUF6Y5T0kz+xLeeOjP1OiPjDYhPoOJRoK9F+Hjbd6OliYIGzw4
-fx1BF1eHD2cwjxPhnX5TabsUNIg+XDpOftOFz3Nd0xJvV/wo+5qs/2reYJ9Cy3Mu
-W5GiMz28R5+mvqfFwcWlKxE=
------END PRIVATE KEY-----
------BEGIN CERTIFICATE-----
-MIIE/zCCAuegAwIBAgIBGTANBgkqhkiG9w0BAQsFADCBgjESMBAGCgmSJomT8ixk
-ARkWAmRlMRcwFQYKCZImiZPyLGQBGRYHYmFsb2doczEeMBwGA1UECgwVQmFsdVNp
-Z24gUHJpdmF0ZSBTaXRlMRUwEwYDVQQLDAxQS0kgU2VydmljZXMxHDAaBgNVBAMM
-E0JhbHVTaWduIFNpZ25pbmcgQ0EwHhcNMjMwNDA2MjA0NzAzWhcNMjUwNDA1MjA0
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-Zm9TZWMxDzANBgNVBAMMBnN5c3RlbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC
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-D5CDWJ/gU76SlHeGlCOIzZ1vA22Qk/EVr5D+SztFHIJFcSh2xVRHVEogXBUvP19d
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-VR0OBBYEFChB5D78HhhGGcKxvgszx5ayC+IAMB8GA1UdIwQYMBaAFEgj5ZNUgwMs
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-/vEW/Pf//9pei53rVvI+dMUk0KG7+JEXiBaEMeEyLZB5nHhx1Bm5dgt1Lh6cVssl
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-4IPqM1lV5EYK9OzkRgORez3yt4O3mjkkrthlv+8/k/05ATl/hzwMMmHe4/DkLFPQ
-7bJ+S1Fvwc8VJ141HzayDmjDI+bN1uQk+VwHYWu9qdYmYCL54Id9mGz8wg5xIE/f
-fHMYsZ7NZkxLaJsj7/mKaagWaQdicjVPmjrdr2RIgECE6O4=
------END CERTIFICATE-----
\ No newline at end of file
diff --git a/etc-zntrl/kopano/ssl/private/kopano.server.key b/etc-zntrl/kopano/ssl/private/kopano.server.key
deleted file mode 100644
index 8fa7ca2..0000000
--- a/etc-zntrl/kopano/ssl/private/kopano.server.key
+++ /dev/null
@@ -1,57 +0,0 @@
------BEGIN PRIVATE KEY-----
-MIIEvwIBADANBgkqhkiG9w0BAQEFAASCBKkwggSlAgEAAoIBAQDUaqPaB3LmCcTr
-5KqC4AM0XmszfzGYgTFfa8JZ+XrZDSOnDOhzwe1gyEg4232fd7jXK9iYQ8s7kvYK
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-N8rLF85Pj/rBtRIu/GCfOq36qDVEY+PhiFl+urJLQSTmGLjspbtYMPjR8gzGJ53+
-PR9aqbwVSo0nVL3G5078NHdWu5aog3Xfks1C9nwDLGUPRlyVsmMFKH4qjOkVqAHN
-6q740QNSQNwTciL3dGyX863/Yo0ILXMA7zI8hGyfGQKBgQCcm5EVY88/ww4VtJHW
-fqDG9ymnl6OpF0BbYFbeby1Cay7dOHJ3AoKIFY2yl+YqxHJZ0MuqFoJN3ZSvBlEX
-Ghs7QN/QefotavaGtF5/WyfMW6Sjyy5izDaCrQsCpL5l6iEd8ZrO2CBXk/XnuvfI
-lsO6p2syP9Ud5o/8adh9B8JOfg==
------END PRIVATE KEY-----
------BEGIN CERTIFICATE-----
-MIIE/zCCAuegAwIBAgIBGDANBgkqhkiG9w0BAQsFADCBgjESMBAGCgmSJomT8ixk
-ARkWAmRlMRcwFQYKCZImiZPyLGQBGRYHYmFsb2doczEeMBwGA1UECgwVQmFsdVNp
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-qNQojU6DPVt3ie6qT4S0ZxASsa5E5C5ouH+hSWLV7dPhd2HnVlswBxWoJjeTcSLu
-cj9NhBr7HNBCjsh1Gj6Q2uC2Njd+Ea0XgM72LTtYh9EN1FY=
------END CERTIFICATE-----
\ No newline at end of file
diff --git a/etc-zntrl/kopano/ssl/private/server-key-cert.pem b/etc-zntrl/kopano/ssl/private/server-key-cert.pem
new file mode 100644
index 0000000..d8410b4
--- /dev/null
+++ b/etc-zntrl/kopano/ssl/private/server-key-cert.pem
@@ -0,0 +1,81 @@
+-----BEGIN PRIVATE KEY-----
+MIIG/gIBADANBgkqhkiG9w0BAQEFAASCBugwggbkAgEAAoIBgQDD8D6c+I14MM0k
+1Qj7wegQ7SutYDWXSfpLSQXp9RuB3ZKyjU9c0J4wilkK00Y7gdIKZN8tMlF2rQ3F
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+O2CDRbfNpGoW/7XAC18CgcEA3dlrXNY/zA3BMtN6HgxkrVrbIDd5BPkbfuhBTSb4
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+4kLhbUn9jU5asTcL22V2Z8M/ic833VqNCYmucGUUx6j6QQgfbYM+hsQ5w4MFwrae
+O8ZUs6iTPyVgxAbBt2zFMH4I
+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/etc-zntrl/kopano/ssl/private/system-key-cert.pem b/etc-zntrl/kopano/ssl/private/system-key-cert.pem
new file mode 100644
index 0000000..229efe1
--- /dev/null
+++ b/etc-zntrl/kopano/ssl/private/system-key-cert.pem
@@ -0,0 +1,81 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
\ No newline at end of file
diff --git a/etc-zntrl/kopano/sslkeys/kopano.client.pem b/etc-zntrl/kopano/sslkeys/kopano.client.pem
deleted file mode 100644
index 5260b0b..0000000
--- a/etc-zntrl/kopano/sslkeys/kopano.client.pem
+++ /dev/null
@@ -1,69 +0,0 @@
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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\ No newline at end of file
diff --git a/etc-zntrl/kopano/sslkeys/system-public-key.pem b/etc-zntrl/kopano/sslkeys/system-public-key.pem
new file mode 100644
index 0000000..325bad9
--- /dev/null
+++ b/etc-zntrl/kopano/sslkeys/system-public-key.pem
@@ -0,0 +1,11 @@
+-----BEGIN PUBLIC KEY-----
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\ No newline at end of file
diff --git a/etc-zntrl/postfix/ssl/certs/balusign-signing-ca.pem b/etc-zntrl/postfix/ssl/certs/balusign-signing-ca.pem
index e438244..10c08d7 100644
--- a/etc-zntrl/postfix/ssl/certs/balusign-signing-ca.pem
+++ b/etc-zntrl/postfix/ssl/certs/balusign-signing-ca.pem
@@ -1,70 +1,106 @@
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 -----BEGIN CERTIFICATE-----
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-
diff --git a/etc-zntrl/postfix/ssl/nuc0-full-chain.pem b/etc-zntrl/postfix/ssl/nuc0-full-chain.pem
index 2f38aa2..ea3b47a 100644
--- a/etc-zntrl/postfix/ssl/nuc0-full-chain.pem
+++ b/etc-zntrl/postfix/ssl/nuc0-full-chain.pem
@@ -1,98 +1,148 @@
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 -----END CERTIFICATE-----
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
diff --git a/etc-zntrl/postfix/ssl/private/nuc0.lan.key b/etc-zntrl/postfix/ssl/private/nuc0.lan.key
index e4d43ac..f64176b 100644
--- a/etc-zntrl/postfix/ssl/private/nuc0.lan.key
+++ b/etc-zntrl/postfix/ssl/private/nuc0.lan.key
@@ -1,28 +1,40 @@
 -----BEGIN PRIVATE KEY-----
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-RxMXnFUxv/vu96lzCTAyRQ==
------END PRIVATE KEY-----
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+lTFPFvT2z66CYRf/2B8rgdX7A38iySy1DzfjoBztXejEKXceA0sMRn88mrO9tFxK
+2LtdK5viIw4yZEypqXTzTp8rqvcQ0PGnlOCU8PnVeuhvH/IhSdqUvHLZwrKMsSy/
+udpQ0pstUAoo/+rWJIzjDNcF/asFX0j0AtP4AfTf23W9m8e2pp0SkaZ5VG13Me0F
+NaQ1TXiaoknMfg2YG4MCgcBNcn6QnttlGQShf1Ds9YAD1iLkTe0rYi7KSZ+Sh40T
+5Y5HPMniA/ufiMJsdWQ6rgtJ9yjFw7uC3RlwNIdfTTzS1CkawK47kVIfsZ9BDTtC
+uW2tBTm0aABUewNSmnrOxxAE12alD2gmmU1gz/c2FkZ21bLmcF+RjIzgJhyCD7rQ
+3CsN3IvSLLlup9ig2W7KpLJ/SzFXCF3Q62TprJuGF3Y/+Xu9kfVNGd4rSNZSo8NZ
+GAo61UauOk2kSB6B9crXzYo=
+-----END PRIVATE KEY-----
\ No newline at end of file
diff --git a/etc-zntrl/postfix/virtual.db b/etc-zntrl/postfix/virtual.db
deleted file mode 100644
index 4ee150b..0000000
Binary files a/etc-zntrl/postfix/virtual.db and /dev/null differ
diff --git a/etc-zntrl/postfix/vmailbox.db b/etc-zntrl/postfix/vmailbox.db
deleted file mode 100644
index fd501d7..0000000
Binary files a/etc-zntrl/postfix/vmailbox.db and /dev/null differ
diff --git a/postfix/Dockerfile b/postfix/Dockerfile
index a3a1ba8..d06cc64 100644
--- a/postfix/Dockerfile
+++ b/postfix/Dockerfile
@@ -1,8 +1,16 @@
-# syntax=docker/dockerfile:1
-FROM alpine:latest
+# syntax=docker.io/docker/dockerfile:1.5.2
+FROM ubuntu:20.04
 # install apt packages
 ENV TZ Europe/Berlin 
-RUN apk add --no-cache postfix spamassassin rsyslog logrotate xz
+RUN <<EOF
+apt-get update
+apt-get install -y postfix
+# cleanup
+apt-get autoclean
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
+echo zntrl.de >>/etc/mailname
+EOF
+COPY etc/postfix/ /etc/postfix/
 COPY --chmod=0775 entrypoint.sh /entrypoint.sh
 EXPOSE 25
 VOLUME /var/spool/postfix
diff --git a/postfix/Dockerfile.alpine b/postfix/Dockerfile.alpine
new file mode 100644
index 0000000..3fd2e21
--- /dev/null
+++ b/postfix/Dockerfile.alpine
@@ -0,0 +1,10 @@
+# syntax=docker.io/docker/dockerfile:1.5.2
+FROM alpine:latest
+# install apt packages
+ENV TZ Europe/Berlin 
+RUN apk add --no-cache postfix spamassassin rsyslog logrotate xz
+COPY --chmod=0775 entrypoint.sh /entrypoint.sh
+EXPOSE 25
+VOLUME /var/spool/postfix
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["postfix", "start-fg"]
\ No newline at end of file
diff --git a/postfix/Dockerfile.ubuntu b/postfix/Dockerfile.ubuntu
deleted file mode 100644
index 19c729a..0000000
--- a/postfix/Dockerfile.ubuntu
+++ /dev/null
@@ -1,13 +0,0 @@
-# syntax=docker/dockerfile:1.3-labs
-FROM ubuntu:20.04
-# install apt packages
-RUN <<EOF 
-apt-get update -y
-apt-get install -y postfix spampd 
-apt-get autoclean
-rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
-EOF
-WORKDIR /root
-EXPOSE 25
-VOLUME /var/spool/postfix
-ENTRYPOINT ["/usr/sbin/postmulti -i %i -p start"]
\ No newline at end of file
diff --git a/postfix/docker-compose.yml b/postfix/docker-compose.yml
deleted file mode 100644
index bcdb8ff..0000000
--- a/postfix/docker-compose.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-version: '3'
-services:
-  postfix:
-    image: postfix:latest
-    container_name: postfix
-    restart: always
-    networks:
-      - kopano
-    volumes:
-      - ~/kopano/postfix/etc/postfix:/etc/postfix
-      - spool:/var/spool/postfix
-networks:
-  - kopano
-volumes:
-  - spool:
diff --git a/postfix/entrypoint.sh b/postfix/entrypoint.sh
index 277827a..e12de57 100644
--- a/postfix/entrypoint.sh
+++ b/postfix/entrypoint.sh
@@ -1,3 +1,6 @@
 #!/usr/bin/env sh
-set -e
+# set -e
+cd /etc/postfix
+postmap virtual
+postmap vmailbox
 exec "$@"
diff --git a/postfix/etc/postfix/main.cf b/postfix/etc/postfix/main.cf
new file mode 100644
index 0000000..ed6895b
--- /dev/null
+++ b/postfix/etc/postfix/main.cf
@@ -0,0 +1,59 @@
+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
+biff = no
+maillog_file = /dev/stdout
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+readme_directory = no
+
+# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 2 on
+# fresh installs.
+compatibility_level = 2
+
+# local domains
+myhostname = nuc0.fritz.box
+mydestination = $myhostname, localhost.fritz.box, localhost
+alias_maps = hash:/etc/aliases
+alias_database = hash:/etc/aliases
+myorigin = /etc/mailname
+mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
+
+# virtual domains
+virtual_mailbox_domains = zntrl.de 
+virtual_mailbox_maps = hash:/etc/postfix/vmailbox
+virtual_alias_maps = hash:/etc/postfix/virtual
+# virtual_transport = lmtp:unix:/var/spool/kopano/dagent.sock
+virtual_transport = lmtp:dagent:2003
+
+# default domains
+default_transport = smtp:[relay.zntrl.de]:465
+
+# SMPTD (inbound) TLS parameters
+smtpd_tls_CApath = /etc/ssl/certs
+smtpd_tls_CAfile = /etc/postfix/ssl/certs/balusign-signing-ca.pem
+smtpd_tls_cert_file = /etc/postfix/ssl/nuc0-full-chain.pem
+smtpd_tls_key_file = /etc/postfix/ssl/private/nuc0.lan.key
+smtpd_tls_security_level=may
+smtpd_tls_loglevel = 1
+
+smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
+
+# SMTP (outbound)
+smtp_tls_CApath=/etc/ssl/certs
+smtp_tls_key_file = /etc/postfix/ssl/private/nuc0.lan.key
+smtp_tls_cert_file = /etc/postfix/ssl/nuc0-full-chain.pem
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+smtp_tls_wrappermode = yes
+smtp_tls_security_level = encrypt
+smtp_tls_loglevel = 1
+
+mailbox_size_limit = 0
+message_size_limit = 50000000
+recipient_delimiter = +
+inet_interfaces = all
+inet_protocols = all
+
diff --git a/postfix/etc/postfix/master.cf b/postfix/etc/postfix/master.cf
new file mode 100644
index 0000000..26f51e5
--- /dev/null
+++ b/postfix/etc/postfix/master.cf
@@ -0,0 +1,67 @@
+#
+# Postfix master process configuration file.  For details on the format
+# of the file, see the master(5) manual page (command: "man 5 master" or
+# on-line: http://www.postfix.org/master.5.html).
+#
+# Do not forget to execute "postfix reload" after editing this file.
+#
+# ==========================================================================
+# service type  private unpriv  chroot  wakeup  maxproc command + args
+#               (yes)   (yes)   (no)    (never) (100)
+# ==========================================================================
+smtp      inet  n       -       y       -       -       smtpd
+#smtp      inet  n       -       y       -       1       postscreen
+#smtpd     pass  -       -       y       -       -       smtpd
+#dnsblog   unix  -       -       y       -       0       dnsblog
+#tlsproxy  unix  -       -       y       -       0       tlsproxy
+#submission inet n       -       y       -       -       smtpd
+#  -o syslog_name=postfix/submission
+#  -o smtpd_tls_security_level=encrypt
+#  -o smtpd_sasl_auth_enable=yes
+#  -o smtpd_tls_auth_only=yes
+#  -o smtpd_reject_unlisted_recipient=no
+#  -o smtpd_client_restrictions=$mua_client_restrictions
+#  -o smtpd_helo_restrictions=$mua_helo_restrictions
+#  -o smtpd_sender_restrictions=$mua_sender_restrictions
+#  -o smtpd_recipient_restrictions=
+#  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
+#  -o milter_macro_daemon_name=ORIGINATING
+#smtps     inet  n       -       y       -       -       smtpd
+#  -o syslog_name=postfix/smtps
+#  -o smtpd_tls_wrappermode=yes
+#  -o smtpd_sasl_auth_enable=yes
+#  -o smtpd_reject_unlisted_recipient=no
+#  -o smtpd_client_restrictions=$mua_client_restrictions
+#  -o smtpd_helo_restrictions=$mua_helo_restrictions
+#  -o smtpd_sender_restrictions=$mua_sender_restrictions
+#  -o smtpd_recipient_restrictions=
+#  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
+#  -o milter_macro_daemon_name=ORIGINATING
+#628       inet  n       -       y       -       -       qmqpd
+pickup    unix  n       -       y       60      1       pickup
+cleanup   unix  n       -       y       -       0       cleanup
+qmgr      unix  n       -       n       300     1       qmgr
+#qmgr     unix  n       -       n       300     1       oqmgr
+tlsmgr    unix  -       -       y       1000?   1       tlsmgr
+rewrite   unix  -       -       y       -       -       trivial-rewrite
+bounce    unix  -       -       y       -       0       bounce
+defer     unix  -       -       y       -       0       bounce
+trace     unix  -       -       y       -       0       bounce
+verify    unix  -       -       y       -       1       verify
+flush     unix  n       -       y       1000?   0       flush
+proxymap  unix  -       -       n       -       -       proxymap
+proxywrite unix -       -       n       -       1       proxymap
+smtp      unix  -       -       y       -       -       smtp
+relay     unix  -       -       y       -       -       smtp
+        -o syslog_name=postfix/$service_name
+#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
+showq     unix  n       -       y       -       -       showq
+error     unix  -       -       y       -       -       error
+retry     unix  -       -       y       -       -       error
+discard   unix  -       -       y       -       -       discard
+local     unix  -       n       n       -       -       local
+virtual   unix  -       n       n       -       -       virtual
+lmtp      unix  -       -       n       -       -       lmtp
+anvil     unix  -       -       y       -       1       anvil
+scache    unix  -       -       y       -       1       scache
+postlog   unix-dgram n  -       n       -       1       postlogd
diff --git a/postfix/etc/postfix/ssl/certs/balusign-signing-ca.pem b/postfix/etc/postfix/ssl/certs/balusign-signing-ca.pem
new file mode 100644
index 0000000..10c08d7
--- /dev/null
+++ b/postfix/etc/postfix/ssl/certs/balusign-signing-ca.pem
@@ -0,0 +1,106 @@
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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diff --git a/postfix/etc/postfix/ssl/nuc0-full-chain.pem b/postfix/etc/postfix/ssl/nuc0-full-chain.pem
new file mode 100644
index 0000000..ea3b47a
--- /dev/null
+++ b/postfix/etc/postfix/ssl/nuc0-full-chain.pem
@@ -0,0 +1,148 @@
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+puj2FaXSotGQZywm8hmqMU8hCti3m93FQDpcsgoSqiilmnLRIAWXVrSKRlXXTxKs
+Lpq3x9ZoARYbLEyxhRTdoMeU95OE64R1c6mcCcWPu53v59wYKmVMBOi4blTAXFn2
+9KEbwtgDcAdXTn6SGAOvrdibEG2GnBhTw689vJfC7Z2imGoDxwMKToCnK9tgwAwO
+/lv7oKpnA3GxzYojGZcKMGGGlfKFftZd36X/NZDmn9nmIGCqR0P04YWoX3utJOJH
+03bK11O62l9DQNEJSQ5Zjow5HMuhxTfhka4I0edjsoIekxePAR11riIHpfwLQWmF
+OybPqyC9MHzTLzSsISdZV1SDRQzCfpGbRtQSYAPF/T/hr2E2g+L+1tduQ07LICB0
++yKYtwF1rXkWwD4NvVYrk94fTCBPHK5SaMol8YlPer1ZUw==
+-----END CERTIFICATE-----
diff --git a/postfix/etc/postfix/ssl/private/nuc0.lan.key b/postfix/etc/postfix/ssl/private/nuc0.lan.key
new file mode 100644
index 0000000..f64176b
--- /dev/null
+++ b/postfix/etc/postfix/ssl/private/nuc0.lan.key
@@ -0,0 +1,40 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
\ No newline at end of file
diff --git a/postfix/etc/postfix/virtual b/postfix/etc/postfix/virtual
new file mode 100644
index 0000000..5a0132b
--- /dev/null
+++ b/postfix/etc/postfix/virtual
@@ -0,0 +1,3 @@
+postmaster@zntrl.de postmaster
+abuse@zntrl.de  postmaster
+
diff --git a/postfix/etc/postfix/vmailbox b/postfix/etc/postfix/vmailbox
new file mode 100644
index 0000000..e94879f
--- /dev/null
+++ b/postfix/etc/postfix/vmailbox
@@ -0,0 +1,6 @@
+baloan@zntrl.de      notused
+blu3prince@zntrl.de  notused
+fafnir@zntrl.de      notused
+postmaster@zntrl.de  notused
+# Comment out the entry below to implement a catch-all.
+# @zntrl.de		         notused
diff --git a/webapp/Dockerfile b/webapp/Dockerfile
index aab3cdb..d2a5b2f 100644
--- a/webapp/Dockerfile
+++ b/webapp/Dockerfile
@@ -1,11 +1,11 @@
-# syntax=docker/dockerfile:1.4
+# syntax=docker.io/docker/dockerfile:1.5.2
 FROM ubuntu:20.04
-# install apt packages
 RUN <<EOF
 export DEBIAN_FRONTEND=noninteractive 
 export TZ=Europe/Berlin 
 apt-get update
-apt-get install -y --no-install-recommends tzdata wget gnupg apache2
+apt-get install -y --no-install-recommends tzdata wget gnupg apache2 ca-certificates
+update-ca-certificates
 # install php7-mapi and dependencies
 wget --no-verbose -P/tmp http://bldr/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64.tar.gz 
 tar xzf /tmp/core-11.0.2.50.507cbae-Ubuntu_20.04-amd64.tar.gz
@@ -26,7 +26,6 @@ rm -rf core-11.0.2.50.507cbae-Ubuntu_20.04-amd64
 EOF
 # use envsubst in entrypoint script to convert config templates to actual config files
 RUN <<EOF
-# phpenmod kopano
 sed -i -e's/define("SECURE_COOKIES", true);/define("SECURE_COOKIES", false);/' /etc/kopano/webapp/config.php
 EOF
 COPY --chmod=0775 entrypoint.sh /entrypoint.sh
diff --git a/z-push/Dockerfile b/z-push/Dockerfile
index bd727ac..5d59332 100644
--- a/z-push/Dockerfile
+++ b/z-push/Dockerfile
@@ -1,6 +1,5 @@
-# syntax=docker/dockerfile:1.4
+# syntax=docker.io/docker/dockerfile:1.5.2
 FROM ubuntu:20.04
-# install apt packages
 RUN <<EOF
 export DEBIAN_FRONTEND=noninteractive 
 export TZ=Europe/Berlin 
@@ -25,11 +24,8 @@ apt-get autoclean
 rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ~/.cache ~/.npm
 rm -rf core-11.0.2.50.507cbae-Ubuntu_20.04-amd64
 EOF
-# change php.ini
-#sed -i -e 's/short_open_tag = Off/short_open_tag = on/' /etc/php/7.4/apache2/php.ini
-#sed -i -e '/register_argc_argv =/a register_globals = off' /etc/php/7.4/apache2/php.ini
-COPY 30-z-push.ini /etc/php/7.4/apache2/conf.d
 # use envsubst in entrypoint script to convert config templates to actual config files
+COPY 30-z-push.ini /etc/php/7.4/apache2/conf.d
 COPY --chmod=0775 entrypoint.sh /entrypoint.sh
 EXPOSE 80
 VOLUME /etc/z-push