Hi,
my main.cf
alias_maps = hash:/etc/aliases compatibility_level = 2 content_filter = amavis:[127.0.0.1]:10024 inet_protocols = ipv4 mailbox_size_limit = 0 message_size_limit = 20480000 myhostname = mail.pratico.work non_smtpd_milters = inet:[127.0.0.1]:12301 recipient_delimiter = + smtpd_banner = $myhostname ESMTP smtpd_milters=inet:[127.0.0.1]:12301 smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_sender, reje$ smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_tls_CApath = /etc/ssl/certs smtpd_tls_cert_file = /etc/letsencrypt/live/mail.pratico.work/fullchain.pem smtpd_tls_eecdh_grade = strong smtpd_tls_key_file = /etc/letsencrypt/live/mail.pratico.work/privkey.pem smtpd_tls_security_level = may smtp_header_checks = regexp:/etc/postfix/header_checks smtp_mime_header_checks = regexp:/etc/postfix/header_checks smtp_tls_CApath = /etc/ssl/certs smtp_tls_cert_file = $smtpd_tls_cert_file smtp_tls_key_file = $smtpd_tls_key_file smtp_tls_security_level = may smtp_use_tls = yes tls_preempt_cipherlist = yes virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_emails.cf, mysql:/etc/postfix/mysql_virtual_alias_maps.cf virtual_gid_maps = static:5000 virtual_mailbox_base = /var/vmail virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_mailbox_domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf virtual_transport = lmtp:unix:private/dovecot-lmtp virtual_uid_maps = static:5000
# Mailman related settings owner_request_special = no transport_maps = hash:/var/lib/mailman3/data/postfix_lmtp local_recipient_maps = proxy:unix:passwd.byname $alias_maps hash:/var/lib/mailman3/data/postfix_lmtp relay_domains = ${{$compatibility_level} < {2} ? {$mydestination} : {}} hash:/var/lib/mailman3/data/postfix_domains