dovecot-core/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dovecot-imapd/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dovecot-lmtpd/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dovecot-mysql/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dovecot-pgsql/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dovecot-pop3d/now 1:2.3.7.2-1ubuntu3.6 amd64 [installed,upgradable to: 1:2.3.7.2-1ubuntu3.7]

dpkg-dev/focal,focal,now 1.19.7ubuntu3 all [installed,upgradable to: 1.19.7ubuntu3.2]

postfix-mysql/now 3.4.13-0ubuntu1.2 amd64 [installed,upgradable to: 3.4.13-0ubuntu1.4]

postfix-pgsql/now 3.4.13-0ubuntu1.2 amd64 [installed,upgradable to: 3.4.13-0ubuntu1.4]

postfix/now 3.4.13-0ubuntu1.2 amd64 [installed,upgradable to: 3.4.13-0ubuntu1.4]

postfixadmin/focal,focal,now 3.2.1-3 all [installed]

Ubuntu20.04

postconf -d | grep mail_version

mail_version = 3.4.13

milter_macro_v = $mail_name $mail_version

ubuntu24

postconf -d | grep mail_version

mail_version = 4.1.16

milter_macro_v = $mail_name $mail_version

超完整详细的Postfix Dovecot电子邮件服务器配置指南-CSDN博客