It appears that you are using the old SMTP server and have not switched to using the current smtp.fastmail.com server on port 465 with an app-specific password. See:
https://www.fastmail.com/help/techni...sandports.html
With the current recommended settings I get connections in under 1/2 second. Here are logs showing the start of two message send sessions using Thunderbird 60.5.0:
Code:
2019-02-08 07:48:19.216000 UTC - [53908:Main Thread]: I/SMTP SMTP Connecting to: smtp.fastmail.com:465
2019-02-08 07:48:19.479000 UTC - [53908:Main Thread]: I/SMTP SMTP entering state: 0
2019-02-08 07:48:19.479000 UTC - [53908:Main Thread]: I/SMTP SMTP Response: 220 smtp.fastmail.com ESMTP ready
Code:
2019-02-08 07:59:16.889000 UTC - [43800:Main Thread]: I/SMTP SMTP Connecting to: smtp.fastmail.com:465
2019-02-08 07:59:17.249000 UTC - [43800:Main Thread]: I/SMTP SMTP entering state: 0
2019-02-08 07:59:17.249000 UTC - [43800:Main Thread]: I/SMTP SMTP Response: 220 smtp.fastmail.com ESMTP ready
I am located in the Dallas, Texas, area and using a FIOS high speed fiber optic connection to my Frontier ISP.
Bill