Hello to all:

I have been trying to integrate and to stand up dovecot, postfix, mailman3 and opendkim. I have been studying the following:

• https://www.frontline.ro/en/blog/how-to-configure-opendkim-with-postfix-on-d...
• https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/mta.ht...
• https://www.linuxbabe.com/mail-server/build-email-server-from-scratch-debian...
• https://www.linuxbabe.com/mail-server/install-dovecot-imap-server-debian

This appears to be the best available coaching, but it would take me weeks to find the time to follow this post:

• https://pieterhollander.nl/post/mailserver/

I was trying to place the Maildir outside my Debian 12 virtual machine for easier backup. The directory /Debian-12-dovecot-Maildir is setup as NFS share on my NAS. I can orchestrate a daily backup or an rclone of that to OneDrive or some other cloud target via my NAS.

I have these errors:

Apr 02 11:17:01 shackleton12 postfix/local[795238]: CA26A2D23: passing <mailman@systemdatabase.ca> to transport=lmtp Apr 02 11:17:01 shackleton12 postfix/local[795238]: warning: connect #1 to subsystem private/lmtp: Connection refused

Apr 02 11:07:00 shackleton12 systemd[1]: Starting dovecot.service - Dovecot IMAP/POP3 email server... Apr 02 11:07:00 shackleton12 dovecot[789615]: Error: service(lmtp): Socket already exists: /var/spool/postfix/private/dovecot-lmtp Apr 02 11:07:00 shackleton12 dovecot[789615]: master: Error: service(lmtp): Socket already exists: /var/spool/postfix/private/dovecot-lmtp Apr 02 11:07:00 shackleton12 dovecot[789615]: Fatal: Failed to start listeners Apr 02 11:07:00 shackleton12 dovecot[789615]: master: Fatal: Failed to start listeners Apr 02 11:07:00 shackleton12 systemd[1]: dovecot.service: Main process exited, code=exited, status=89/n/a Apr 02 11:07:00 shackleton12 systemd[1]: dovecot.service: Failed with result 'exit-code'. Apr 02 11:07:00 shackleton12 systemd[1]: Failed to start dovecot.service - Dovecot IMAP/POP3 email server.

postconf -n doveconf -n

postconf -n

alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no compatibility_level = 3.6 inet_protocols = ipv4 local_recipient_maps = hash:/opt/mailman/mm/var/data/postfix_lmtp mailbox_size_limit = 0 mailbox_transport = lmtp:unix:private/dovecot-lmtp masquerade_domains = systemdatabase.ca milter_default_action = accept milter_protocol = 2 mydestination = $myhostname, systemdatabase.ca, localhost.systemdatabase.ca, localhost, systemdatabase.homelinux.com mydomain = systemdatabase.ca myhostname = systemdatabase.ca mynetworks = 127.0.0.0/8 myorigin = systemdatabase.ca non_smtpd_milters = $smtpd_milters owner_request_special = no proxy_interfaces = 192.168.1.8 readme_directory = no recipient_delimiter = + relay_domains = hash:/opt/mailman/mm/var/data/postfix_domains relayhost = [smtp.bellnet.ca]:25 smtp_tls_loglevel = 1 smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1 smtp_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1 smtp_tls_security_level = may smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_milters = inet:localhost:8891 smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination permit_inet_interfaces smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination permit_inet_interfaces smtpd_tls_cert_file = /etc/letsencrypt/live/systemdatabase.ca-0001/fullchain.pem smtpd_tls_key_file = /etc/letsencrypt/live/systemdatabase.ca-0001/privkey.pem smtpd_tls_loglevel = 1 smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1 smtpd_tls_protocols = !SSLv2, !SSLv3, !TLSv1, !TLSv1.1 smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtputf8_enable = no transport_maps = hash:/opt/mailman/mm/var/data/postfix_lmtp unknown_local_recipient_reject_code = 550

doveconf -n

2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf

Pigeonhole version 0.5.19 (4eae2f79)

OS: Linux 6.1.0-32-amd64 x86_64 Debian 12.10 nfs4

Hostname: shackleton12.systemdatabase.ca

auth_mechanisms = plain login auth_username_format = %n mail_location = maildir:/Debian-12-dovecot-Maildir/%d-%u-Maildir mail_privileged_group = mail namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { driver = pam } protocols = imap lmtp service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } } ssl_cert = </etc/letsencrypt/live/systemdatabase.ca-0001/fullchain.pem ssl_client_ca_dir = /etc/ssl/certs ssl_dh = # hidden, use -P to show it ssl_key = # hidden, use -P to show it ssl_prefer_server_ciphers = yes userdb { driver = passwd }