Add postfix and dovecot dockerfiles, added dovecot deployment (in dev)

dockerfiles/dovecot/Dockerfile

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+FROM alpine:latest
+
+RUN apk --no-cache add dovecot dovecot-lmtpd dovecot-submissiond bash
+
+# RUN wget https://github.com/dovecot/docker/blob/main/2.3.21/dovecot.gpg
+# RUN cp dovecot.gpg /etc/apt/keyrings/dovecot.gpg
+
+# RUN wget https://github.com/dovecot/docker/blob/main/2.3.21/dovecot.list
+# RUN cp dovecot.list /etc/apt/sources.list.d
+
+COPY password_file /etc/dovecot/secrets/dovecot_password.file
+COPY dovecot.conf /etc/dovecot/dovecot.conf
+
+EXPOSE 24
+EXPOSE 143
+EXPOSE 993
+
+CMD [ "dovecot", "-F" ]

dockerfiles/dovecot/dovecot.conf

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+## You should mount /etc/dovecot if you want to
+## manage this file
+
+mail_home=/srv/mail/%Lu
+mail_location=sdbox:~/Mail
+mail_uid=1000
+mail_gid=10000
+
+protocols = imap submission lmtp
+
+first_valid_uid = 1000
+last_valid_uid = 10000
+
+# authentication via passwd-file, see https://doc.dovecot.org/configuration_manual/authentication/passwd_file/#authentication-passwd-file
+passdb {
+  driver = passwd-file
+  args = /etc/dovecot/secrets/dovecot_password_file
+}
+
+# post-login user lookup database, see https://doc.dovecot.org/configuration_manual/authentication/user_databases_userdb/#authentication-user-database
+userdb {
+  driver = passwd-file
+  args = /etc/dovecot/secrets/dovecot_password_file
+  default_fields = home=/home/%u
+}
+
+ssl=no
+# ssl_cert=<cert.pem
+# ssl_key=<key.pem
+
+namespace {
+  inbox = yes
+  separator = /
+}
+
+service lmtp {
+  inet_listener {
+    port = 24
+  }
+}
+
+listen = *
+
+log_path=/dev/stdout
+info_log_path=/dev/stdout
+debug_log_path=/dev/stdout
+
+!include_try /etc/dovecot/conf.d/*.conf

dockerfiles/dovecot/password_file

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+user:{plain}password
+user2:{plain}password2

dockerfiles/postfix/Dockerfile

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+FROM alpine:latest
+
+RUN apk --no-cache add postfix bash openssl
+
+COPY startup.sh /usr/bin/startup.sh
+RUN chmod +x /usr/bin/startup.sh
+COPY main.cf /etc/postfix/main.cf
+COPY virtual /etc/postfix/virtual
+
+EXPOSE 25
+EXPOSE 465
+EXPOSE 587
+
+CMD [ "startup.sh" ]

dockerfiles/postfix/main.cf

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+# Log everything to standard out
+maillog_file = /dev/stdout
+
+# this setting has several side-effects, e.g. the domain of this mail
+# server is now example.com, http://www.postfix.org/postconf.5.html#mydomain
+myhostname = mail.virt.local
+
+# disable all compatibility levels
+compatibility_level = 9999
+
+virtual_mailbox_domains = main.virt.local
+virtual_mailbox_maps = lmdb:/etc/postfix/virtual
+virtual_alias_maps = lmdb:/etc/postfix/virtual
+virtual_transport = lmtp:dovecot.default.svc.cluster.local:24

dockerfiles/postfix/startup.sh

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+#!/bin/bash
+
+set -ex
+
+postmap /etc/postfix/virtual
+newaliases
+
+exec postfix start-fg

dockerfiles/postfix/virtual

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+@mail.virt.local