User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36
Steps to reproduce:
Noticed that an existing message filter (working correctly for years) that forwards certain emails to others stopped working in December, 2018. I have confirmed that this was working fine prior to 12/20/2018, which, coincidentally or not, is when TB version 60.4.0 was released.
When auto-forwarding an email based on a long time existing message filter, email server never receives a QUIT after DATA, so the email eventually gracefully closes without sending.
TB should send a QUIT, telling the server to proceed with the processing of the email.