Hello,
All of a sudden, this morning, my Thunderbird (102.12.0) will not sync my Office365 account's inbox via IMAP. I get the error message that
The current command di… (read more)
Hello,
All of a sudden, this morning, my Thunderbird (102.12.0) will not sync my Office365 account's inbox via IMAP. I get the error message that
The current command did not succeed. The mail server for account [my university account] responded: User is authenticated but not connected.
A couple of seconds later, the above message is replaced by:
Server outlook.office365.com has disconnected. The server may have gone down or there may be a network problem.
The problem occurs on my laptop and on my desktop. I am sure all my settings are correct. I have read the entire thread here: https://answers.microsoft.com/en-us/outlook_com/forum/all/thunderbird-imap-responded-user-is-authenticated/062a82f6-e678-4462-88b7-dd6cc318386f
I have disabled IPV6 as instructed in the preferred answer: advanced config > network.dns.disableIPv6 = true.
I have also added network.dns.ipv4OnlyDomains = office365.com (I also tried outlook.office365.com).
I am using Kaspersky One antivirus. When I installed it, I had to add Outlook in the trusted addresses, as it wouldn't let me send email, but after I did, Thunderbird was again working as expected (this was two months ago). I am adding this detail just in case it is somehow relevant.
I am not sure when Thunderbird updated to 102.12.0 or if this is in any way related to the problem.
Meanwhile, I can sync incoming mail in my Gmail app on Android. I saw that the IMAP setting there uses port 443 instead of 993. When I tried setting 443 in Thunderbird, it simply took too long to connect to the server and timed out.
I don't know what else to try. Hopefully, you can think of a solution.