If you have happened to update your server from 10.3.x to 10.4.x, you may have noticed issues with fetchmail not working anymore.

Older versions of fetchmail would check for an SSL certificate in an opportunistic way but still go ahead if there wasn’t one. More recent versions will interrupt comunications.

If you want to use fetchmail without SSL you must disable it in .fetchmailrc.

To do so add:

sslproto ''

to .fetchmailrc