[libreoffice-users] Mail Merge testing account fails

Dear all,

I'm trying to set up sending emails with mail merge. I entered my
credentials etc. in Tools>Options>LibreOffice Writer>Mail Merge E-mail, but
when I hit "Test Settings", it hangs for a couple minutes and shows me the
following error. Same error with email accounts from several providers.
Is there a way I can fix this?

Many thanks!
Max

LibreOffice could not connect to the outgoing mail server. Check your
system's settings and the settings in LibreOffice. Check the server name,
the port and the secure connections settings
--
<class 'smtplib.SMTPServerDisconnected'>: Connection unexpectedly closed:
[Errno 104] Connection reset by peer, traceback follows
  File "/opt/libreoffice6.0/program/mailmerge.py", line 107, in connect
    self.server = smtplib.SMTP(server, port,timeout=tout)
  File "/opt/libreoffice6.0/program/python-core-3.5.4/lib/smtplib.py", line
251, in __init__
    (code, msg) = self.connect(host, port)
  File "/opt/libreoffice6.0/program/python-core-3.5.4/lib/smtplib.py", line
338, in connect
    (code, msg) = self.getreply()
  File "/opt/libreoffice6.0/program/python-core-3.5.4/lib/smtplib.py", line
391, in getreply
    + str(e))

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