[Bug 1791761] Re: No mail retrieving from a local popa3d server with thunderbird 1.52.9.1

[D. Hugh Redelmeier]

I had a problem much like this.

- in 2020 January.

- Ubuntu 18.04

- broke when I updated Thunderbird from 1:52.7.0+build1-0ubuntu1

- fixed when I rolled it back and pinned it.

With recent updates, even 1:52.7.0+build1-0ubuntu1 failed in a way that
seems the same.

I then updated to the latest version and it still fails.

I have a POP server on my LAN.  Thunderbird accesses it using TLS.

tcpdump shows that Thunderbird opens a TCP/IP connection and does
nothing with it.

I seem to remember (from 2020 January) that someone said that the bug is
actually in a library.  Unfortunately I don't remember which one.  ldd
applied to thunderbird doesn't show any likely candidates.

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https://bugs.launchpad.net/bugs/1791761

Title:
  No mail retrieving from a local popa3d server with thunderbird
  1.52.9.1

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