OS: Pop!_OS 21.04
KMail: 20.12.3-0ubuntu1
kmailtransport-akonadi: 20.12.3-0ubuntu1

Has any had this problem and/or know how to resolve this?

When attempting to sending email through my SMTP server using SMARTTLS it fails with the message:

Code: Select all

E-Mail Sending Failed
Failed to transport message. Connection to server lost.

I created a debug in akonadi. This is the debug with the domain names changed...

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S: 220 mail2.domain.com ESMTP Postfix
C: EHLO pop-os.localnet
S: 250-mail2.domain.com
S: 250-PIPELINING
S: 250-SIZE 15728640
S: 250-ETRN
S: 250-STARTTLS
S: 250-ENHANCEDSTATUSCODES
S: 250-8BITMIME
S: 250-DSN
S: 250 SMTPUTF8
C: STARTTLS
S: 220 2.0.0 Ready to start TLS
C: EHLO pop-os.localnet
S: 250-mail2.domain.com
S: 250-PIPELINING
S: 250-SIZE 15728640
S: 250-ETRN
S: 250-AUTH PLAIN LOGIN
S: 250-ENHANCEDSTATUSCODES
S: 250-8BITMIME
S: 250-DSN
S: 250 SMTPUTF8