thunderbird 78.3.1
Since upgrading to 78.3.1 my Thunderbird can send but will not download or copy sent emails to the sent folder.
Could it be some security setting I am not aware of?
The only error message I get is "Your message was sent but a copy was not placed in your sent folder (Sent) due to network or file access errors."
I am on a Debian Buster system
Chosen solution
You may be facing the problem of the provider's security not being compatible with the new requirements of TB 78:
https://support.mozilla.org/en-US/questions/1295861
That would explain why the account works in 68 but not in 78.
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Who is the mail provider, e.g. gmail or AOL?
I have IMAP accounts from 3 different ISPs 2 are working fine and one is showing this send but not receive. I know the accounts are fine because they all work OK on my laptop which is Thunderbird 68.12.0 I am reluctant to raise a ticket with the ISP when the accounts work fine on my laptop, the only problem is my deaktop running 78.3.1
Switching settings to port 143 and security none is working. Changing back to 993 and SSL not working. This cannot be satisfactory?
Chosen Solution
You may be facing the problem of the provider's security not being compatible with the new requirements of TB 78:
https://support.mozilla.org/en-US/questions/1295861
That would explain why the account works in 68 but not in 78.