Have you tried these solutions?
https://support.mozilla.org/en-US/questions/1263206#answer-1234965
On 7/14/2022 7:22 AM, Paul Kudla (SCOM.CA Internet Services Inc.) wrote:
I know this has been asked before in both Dovecot & Thunderbird Forums
(i will posting this info there as well)
It
I know this has been asked before in both Dovecot & Thunderbird Forums
(i will posting this info there as well)
It seems every once in a while that copy to sent folder timeout occurs
and you have to hit retry a few time for it to complete
I know this is a network issue (ie network speed,
