我一直在尝试运行一个 dovecot/postfix 服务器来为我的初创企业提供电子邮件服务，但我也成为写得不好、过时的指南的受害者。
起初我安装了 Postfix 和 Dovecot，并选择了一个空配置，认为我会自己配置它。在某个时候，我忘记了我实际在做什么以及我配置了什么，所以我决定apt-purge我安装的所有软件包并重新开始。
尝试使用 安装 dovecot 后sudo apt-get install dovecot-imapd，我遇到了以下错误：
The following NEW packages will be installed:
dovecot-imapd
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/425 kB of archives.
After this operation, 565 kB of additional disk space will be used.
Selecting previously unselected package dovecot-imapd.
(Reading database ... 23009 files and directories currently installed.)
Unpacking dovecot-imapd (from .../dovecot-imapd_1%3a2.1.7-7_amd64.deb) ...
Setting up dovecot-imapd …