Public bug reported:
Ubuntu: 20.04 LTS
Kernel: 5.13.0-40-generic
Thunderbird: 91.8.1 (64 bit)
Since starting service with an new ISP, I have been having problems with
Thunderbird outgoing mail (incoming works fine). I did not see this
problem with my previous ISP.
In both plain text and HTML formats, if the body of the email is greater
than approx. 930 characters, when I click <Send>, the progress window
goes to 100% sent, then hangs and eventually times out with the message
not being sent. It shows an error message:
"Sending of message failed
The message could not be sent using Outgoing server for an unknown reason.
Pleas verify that your Outgoing server settings are correct and try again."
I have contacted the new ISP about this and they have no idea what is
causing this except it is not a problem with their SMTP host. All email
settings are as directed by the new ISP.
I have confirmed this on 2 computers, both running the same software by
creating messages with known character counts of over 1000 characters,
created in a basic text editor, and progressively deleting characters
until it is successfully sent and recounting the characters.
I do not see this problem on a Windows 10 machine using the same version
of Thunderbird. I have also tried different email clients on Ubuntu and
see the same issue.
I am at a loss, so any possible clues as to what is going on would be
greatly appreciated.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1970784
Title:
Cannot create an email of more than approx. 930 characters
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