This is still reproducible with thunderbird-bin 153.0b3.
To keep the connection spinner running forever, I blocked my IMAP server
using NFTables rules:
```
sudo nft add table inet filter
sudo nft add chain inet filter output '{ type filter hook output priority 0;
policy accept; }'
sudo nft add rule inet filter output ip6 daddr <IP6ADDR> drop
sudo nft add rule inet filter output ip daddr <IP4ADDR> drop
```
Then I open Thunderbird, and watch it take over 100% CPU while trying to
connect.
This is particularly annoying because it drains my battery when my
laptop connects to a captive portal or to an enterprise network which
blocks IMAP / SMTP.
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https://bugs.launchpad.net/bugs/1012858
Title:
"Sending of message failed" dialog needs 100% of one CPU as long as it
is open.
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