[Bug 1215882]

[Bernhard Riegler]

I have the following environment: Europe, Austria, A1 Provider, sending with Thunderbird 78.7.1(64-bit) on GNU/Linux Ubuntu 20.04 LTS
the outgoing configuration is SMTP port 587 with STARTTLS

everything works fine, but sometimes the Provider SMTP Server is BUSY.
I get in thunderbird client a pop up "load too high (#4.3.0)" and then the email is in 'sent' folder.
as I always put myself a CC in every email, I can guarantee that the email was not processed by the SMTP server.
this matches the pop up message.
this is a transient SMTP server error.
thunderbird client knows this and shall not put this failed output into folder 'sent' , but into folder 'draft' for later retry.

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https://bugs.launchpad.net/bugs/1215882

Title:
  Emails are silently discarded on 554 reply to STARTTLS

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