[Bug 1215882]

[Bernhard Riegler]

I completely agree with jonwestburne
CRITICAL because the user does not know the email was not sent.

I had again a server BUSY condition.
thunderbird version 78.7.1(64-bit) on GNU/Linux Ubuntu 20.04 LTS platform.
popup "load too high (#4.3.0)" and then the email is in 'sent' folder of my local Filesystem Archive.
my automatic "CC to sender" proves that it was not processed by server. I did not receive my CC.

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

Title:
  Emails are silently discarded on 554 reply to STARTTLS

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