Thunderbird version 78 and ESET Internet Security

Posted December 1st, 2020 in Tales From the Support Team, Tech Corner. Tags: .

If you use the Mozilla Thunderbird email program, and it won’t retrieve mail after updating to the latest Thunderbird version 78, this can be caused by a bug in the “ESET Internet Security” (or “Smart Security”) firewall/antivirus program.

In particular, if you use ESET and Thunderbird just hangs with a message saying “checking mail server capabilities”, ESET is almost certainly the cause. There are several threads on their forums about it ([1], [2]), and it’s not related to our servers — Thunderbird 78 works fine with our servers in general.

If this problem is happening to you, ESET has a page explaining how to workaround the bug and get Thunderbird working again.

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