问题：centos7 里的 postfix 日志中提示兼容性信息提示。

尝试：原来是将原debian 里的 postfix 配置文件复制到 centos7 中发生的。默认 centos 不使用 chroot 环境，所以将配置文件中的 chroot 列值，从 - 修改为 n 重启 postfix 就可以了。

Nov 19 23:25:44 localhost postfix/master[865]: /etc/postfix/master.cf: line 18: using backwards-compatible default setting chroot=y
Nov 19 23:25:44 localhost postfix/master[865]: /etc/postfix/master.cf: line 26: using backwards-compatible default setting chroot=y
Nov 19 23:25:44 localhost postfix/master[865]: /etc/postfix/master.cf: line 35: using backwards-compatible default setting chroot=y

参考：

• https://serverfault.com/questions/958761/postfix-using-backwards-compatible-ssl-tls-only-mailserver
• https://serverfault.com/questions/655116/postfix-fails-to-send-mail-with-fatal-unknown-service-smtp-tcp

问题：/var/log/maillog 日志中，有dovecot的警告信息，如

Nov 19 23:25:22 localhost dovecot: imap(laile@s)<1100>: Warning: autocreate plugin is deprecated, use mailbox { auto } setting instead

尝试：将dovecot配置文件中的原：

protocol imap {
  mail_plugins = "autocreate"
}

plugin {
  autocreate = Trash
  autocreate2 = Sent
  autosubscribe = Trash
  autosubscribe2 = Sent
}

替换为：

namespace inbox {
  inbox = yes

  mailbox Trash {
    auto = subscribe # autocreate and autosubscribe the Trash mailbox
    special_use = \Trash
  }
  mailbox Sent {
    auto = subscribe # autocreate and autosubscribe the Sent mailbox
    special_use = \Sent
  }
}

参考：https://serverfault.com/questions/763487/dovecot-autocreate-plugin-is-deprecated-use-mailbox-auto-setting

环境：CentOS7

问题：邮箱用户通过imap登录失败，/var/log/maillog 日志中有错误信息：localhost postfix/submission/smtpd[451]: error: unsupported dictionary type: mysql

尝试：yum install postfix-mysql 安装 postfix-mysql 后重启 postfix

参考：https://serverfault.com/questions/622796/postfix-error-unsupported-dictionary-type-mysql

环境：CentOS7

问题：邮箱用户通过imap登录失败，/var/log/maillog 日志中有错误信息：localhost dovecot: auth: Fatal: sql: Unknown database driver 'mysql'

尝试：yum install dovecot-mysql 安装 dovecot-mysql 后重启 dovecot

参考：https://serverfault.com/questions/334850/dovecot-auth-fatal-unknown-database-driver-pgsql

#! /bin/bash
mv /etc/nginx/sites-enabled/00-default.conf /etc/nginx/sites-available/00-default-temp.conf
mv /etc/nginx/sites-available/00-default-forlets.conf /etc/nginx/sites-enabled/00-default.conf
nginx -s reload
####
acme.sh --issue --nginx -d mail.abc.one -d mail.abc.two
mv /etc/nginx/sites-enabled/00-default.conf /etc/nginx/sites-available/00-default-forlets.conf
mv /etc/nginx/sites-available/00-default-temp.conf /etc/nginx/sites-enabled/00-default.conf
nginx -s reload
####
postfix reload
systemctl restart dovecot

再添加到任务计划中：59 02 1 * * bash /aqtest/renew-ssl.sh > /dev/null

参考：https://quericy.me/blog/860/