Thunderbird stopped receiving email. SOLVED caused by ESET/NOD32
The last email I received from any ISP through Thunderbird 78.5.0 was on 11/27/2020. If I fire up Outlook, I get all the mail I missed over the past 3 days. I've tried resetting the security.tls.version.min value to 1, per this article https://support.mozilla.org/en-US/kb/thunderbird-78-faq#w_how-to-enable-outdated-security-protocols-tls-1-0-and-1-1 and that hasn't helped.
So, I know that my 3 different ISPs are not all having trouble (since Outlook receives my test emails and old email that were sent during the Thunderbird "outage", and my phone received the missing emails).
It doesn't appear to have anything to do with the TLS version, as setting it to 1 has no effect.
I know the date this occurred was 11/27/2020.
I've rebooted the computer and restarted Thunderbird multiple times.
I've tried STARTTLS (which Thunderbird defaulted to) and SSL/TLS (which my ISPs all give as their correct server settings) and nothing makes any difference.
The status bar at the end shows "Checking mail server capabilities..." and never progresses any further.
What else can I try?
Modified by Wayne Mery
Chosen solution
Me too. Close TB, access NOD32 configuration with F5 and go SSL/TLS section. Disable SSL/TLS protocol filtering, save and restart TB.
Tell me if it works now.
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Update: I just tried sending an email, and got the following error:
Your message was sent but a copy was not placed in your sent folder (SentMail) due to network or file access errors. You can retry or save the message locally to Local Folder/SentMail-(email addres on ISP domain)
Again, I changed nothing prior to realizing I'm not receiving any email vial Thunderbird.
I deleted one of my email accounts, and recreated it. While all the settings are identical to those on Outlook, Thunderbird complains that it's "Unable to log in at server. Probably wrong configuration, username or password." Again, all the settings are identical in both Thunderbird (which cannot log in to the server) and Outlook (which can log in to the server).
Do you have any ESET solution installed?
Yes, I do. I have NOD32 installed (and have done for many years).
Ha! So it was the email scanning option! LOL Thanks for pointing me in the right direction!
Chosen Solution
Me too. Close TB, access NOD32 configuration with F5 and go SSL/TLS section. Disable SSL/TLS protocol filtering, save and restart TB.
Tell me if it works now.
It sure does! Thank you! I wouldn't have found that on my own!