Hi
I have a problem with Thunderbird which might be a bit niche but here goes...
The first attempt at sending an email fails as TLS Record Layer v1 is used, the mail serv… (read more)
Hi
I have a problem with Thunderbird which might be a bit niche but here goes...
The first attempt at sending an email fails as TLS Record Layer v1 is used, the mail server sees this and hard resets the connection so sending halts. See attached Wireshark trace screenshot "Failed".
If I retry the send again Thunderbird uses TLS Record Layer v1.3 and the email goes out ok. See attached Wireshark trace screenshot "Success".
If I send another message immediately no problem but if I wait 20-30 minutes the above cycle happens again.
I have set the minimum TLS version in the config to 1.3 (option 4) and restarted Thunderbird but this has not changed anything.
Any ideas how I can fix this? It's a pain because automated replies don't work.