On Wed, Nov 04, 2020 at 05:48:52PM +0000, isdtor wrote:

The --with-gss is actually only used for IMAP authentication.  For SMTP,
Mutt's (simple) implementation relies entirely on SASL.  Is it possible you
don't have the modules installed for SASL's GSSAPI support?

If you're on a Debian derivative, try installing libsasl2-modules-gssapi-mit
or libsasl2-modules-gssapi-heimdal and see if that helps.  (I'm not very
familiar with GSSAPI and am not sure which package might be the appropriate
one.)

I checked - cyrus-sasl-2.1 plus gssapi, ldap, md5, ntlm, plain modules are all 
installed.

Try running mutt at debug level 2 and see what it prints. There should be a message:
  smtp_authenticate: Trying method XXX
for each method, and then hopefully something inside the SASL authentication starting with:
  smtp_auth_sasl: ....

I don't know what the problem is, but perhaps it will give a clue.

--
Kevin J. McCarthy
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