Fetchmail 不使用指定的协议

我正在尝试设置 fetchmail 以使用 pop3 从 gmail 下载一些邮件。如您所见，问题在于 fetchmail 而不是使用 pop 协议将使用 imap。

为了确保在配置过程中不犯任何错误，我将总结该过程：

1. 我在 /etc/default 文件夹中编辑了名为“fetchmail”的文件，并将变量 demo 设置为“yes”；

2. 现在我在文件夹 /etc 中创建了配置文件“fetchmailrc”。在这篇文章中，我写道：

   set postmaster "root"
   set daemon 600
   
   poll pop.gmail.com with proto POP3
       user '[email protected]' there with password 'secretPWD' is root here options ssl
   

3. 然后我继续进行测试，看看它是否使用命令：“fetchmail -d0 -vk pop.gmail.com”。该命令的响应如下：

   fetchmail: 6.4.2 querying pop.gmail.com (protocol auto) at Mon Jul 12 12:43:41 2021: poll started
   fetchmail: 6.4.2 querying pop.gmail.com (protocol IMAP) at Mon Jul 12 12:43:41 2021: poll started
   Trying to connect to 173.194.69.109/143...connection failed.
   fetchmail: connection to pop.gmail.com:imap [173.194.69.109/143] failed: Connection timed out.
   Trying to connect to 173.194.69.108/143...connection failed.
   fetchmail: connection to pop.gmail.com:imap [173.194.69.108/143] failed: Connection timed out.
   Trying to connect to 2a00:1450:4013:c00::6c/143...connection failed.
   fetchmail: connection to pop.gmail.com:imap [2a00:1450:4013:c00::6c/143] failed: Network is unreachable.
   Trying to connect to 2a00:1450:4013:c00::6d/143...connection failed.
   fetchmail: connection to pop.gmail.com:imap [2a00:1450:4013:c00::6d/143] failed: Network is unreachable.
   fetchmail: Connection errors for this poll:
   name 0: connection to pop.gmail.com:imap [173.194.69.109/143] failed: Connection timed out.
   name 1: connection to pop.gmail.com:imap [173.194.69.108/143] failed: Connection timed out.
   name 2: connection to pop.gmail.com:imap [2a00:1450:4013:c00::6c/143] failed: Network is unreachable.
   name 3: connection to pop.gmail.com:imap [2a00:1450:4013:c00::6d/143] failed: Network is unreachable.
   IMAP connection to pop.gmail.com failed: Network is unreachable
   fetchmail: 6.4.2 querying pop.gmail.com (protocol IMAP) at Mon Jul 12 12:48:02 2021: poll                         completed
   fetchmail: 6.4.2 querying pop.gmail.com (protocol auto) at Mon Jul 12 12:48:02 2021: poll completed
   fetchmail: Query status=2 (SOCKET)
   fetchmail: normal termination, status 2
   

我可以假设，fetchmail 试图强制 imap 协议而不是 pop。我完全不明白为什么要这样做。

也许我的低意识让我错过了一些东西。现在我正在开发最新版本的 Ubuntu 服务器。非常感谢您的关注，我很抱歉我的英语不好。

PS我知道不鼓励使用root帐户，但现在我只做一些尝试。当我了解如何配置 fetchmail 后，下一步是使用 postfix、dovecot 和 fetchmail 设置一个完整的邮件服务器。另外，我已经知道 getmail 的存在以及他非常简单的设置。但现在我想了解这个错误的原因。