My SeaMonkey application already had two Yahoo accounts with a server. But in SeaMonkey the settings have to be done manually. In Thunderbird, once you enter a gmail address, it automatically sets the IMAP and SMTP settings. So I ticked that off.Ģ) I learned how Thunderbird and SeaMonkey set up accounts differently. I finally solved my problems (more than one).ġ) I eventually discovered in the Gmail account settings that POP was enabled but IMAP was not. I want to keep using Thunderbird on my PC and not have to go to GMail website to use it.ĭear sfhowes, thanks for all your help. I have used Thunderbird successfully for years. I need this new account for a volunteer position that I have. I followed the YouTube video on how to add your Gmail account to Thunderbird that appears on Mozilla Support. One help website recommended >Port 587, OAuth2, STARTTLS> but that did not work either. When I look at the STMP settings, they are all identical with the one that works except for the new email address. I already have another Gmail account in Thunderbird that has always worked just fine. In Thunderbird, the email account is created automatically in SeaMonkey, I created it manually. I have tried everything - removing account and re-creating the account several times. Outgoing mail does not arrive in destination inbox.

In Thunderbird and SeaMonkey, only the Incoming mail works. I have added a new Gmail account in Thunderbird (also did it in SeaMonkey and BlueMail).

Thunderbird not receiving some emails