Add spamassasin/pyzor/razor support and cleanup Dockerfile and config

core/config/postfix/postfix.main.cf

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+# See /usr/share/postfix/main.cf.dist for a commented, more complete version
+
+# Debian specific:  Specifying a file name will cause the first
+# line of that file to be used as the name.  The Debian default
+# is /etc/mailname.
+#myorigin = /etc/mailname
+
+inet_protocols = all
+
+smtpd_banner = $myhostname ESMTP $mail_name
+biff = no
+
+# appending .domain is the MUA's job.
+append_dot_mydomain = no
+
+# Uncomment the next line to generate "delayed mail" warnings
+#delay_warning_time = 4h
+
+readme_directory = no
+
+# TLS parameters
+smtpd_tls_cert_file=/etc/ssl/server/email.crt
+smtpd_tls_key_file=/etc/ssl/server/email.key
+smtpd_use_tls=yes
+smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
+smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
+
+# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
+# information on enabling SSL in the smtp client.
+
+myhostname = localhost
+#alias_maps = hash:/etc/mail/aliases
+#alias_database = hash:/etc/mail/aliases
+mydestination = localhost.localdomain, localhost
+relayhost =
+mynetworks = 127.0.0.0/8 [::1]/128
+mailbox_size_limit = 0
+recipient_delimiter = +
+
+# SMTP configuration for incoming mail (port 25)
+# Outgoing mail (port 587) configuration  is specified in master.cf
+
+# allow all connections (since we want to receive mail from outside)
+smtpd_client_restrictions = permit
+
+# Don't talk to mail systems that don't know their own hostname.
+# With Postfix < 2.3, specify reject_unknown_hostname.
+smtpd_helo_restrictions = permit
+
+# Don't accept mail from domains that don't exist.
+smtpd_sender_restrictions = permit
+
+# Only accept mail where this server is the final destination
+smtpd_relay_restrictions = permit_auth_destination, permit_mynetworks, reject
+
+# Mail thats not for us gets filtered out by smtpd_relay_restrictions
+# When the mail is for us, we just accept everything. (could add spam blocklists/user checking etc. here)
+smtpd_recipient_restrictions = permit
+
+# Delivery to dovecot
+#alias_maps = hash:/etc/mail/aliases
+#alias_database = hash:/etc/mail/aliases
+virtual_alias_maps = hash:/etc/postfix/virtual
+virtual_mailbox_domains = /etc/postfix/virtual-mailbox-domains
+virtual_mailbox_maps = hash:/etc/postfix/virtual-mailbox-maps
+virtual_transport = dovecot
+dovecot_destination_recipient_limit = 1
+
+# additional authentication settings
+smtpd_tls_auth_only = yes
+smtpd_sasl_auth_enable = yes
+smtpd_sasl_type = dovecot
+smtpd_sasl_path = private/auth

core/config/postfix/postfix.master.cf.append

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+dovecot   unix  -       n       n       -       -       pipe
+ flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver -f ${sender} -d ${recipient}
+
+# we need to be permissive with the helo restrictions since the client can only
+# authenticate after HELO has been sent
+submission      inet    n       -       n       -       -       smtpd
+ -o smtpd_etrn_restrictions=reject
+ -o smtpd_sasl_type=dovecot
+ -o smtpd_sasl_path=private/auth
+ -o smtpd_sasl_auth_enable=yes
+ -o smtpd_helo_restrictions=permit
+ -o smtpd_client_restrictions=permit_sasl_authenticated,reject
+ -o smtpd_sender_restrictions=permit_sasl_authenticated,reject
+ -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
+ -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
+
+spamassassin unix -     n       n       -       -       pipe
+ user=vmail:vmail argv=/usr/bin/spamc -f -e
+ /usr/sbin/sendmail -oi -f ${sender} ${recipient}