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[SOLVED] SMTP Error (334): Authentication failed

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Durwin:
I run Fedora.  I had been running Fedora 30 when all worked great.
After I upgraded to Fedora 31,  I started getting error in subject
every time I try to send an email.  I've made no other changes
other then upgrade to 31.  I see nothing in journalctl, or http logs.

I have another email client that still sends ok.

Any help on this?

Thank you,

Durwin

Durwin:
I checked the 'status' of sendmail and it shows this.

localhost [127.0.0.1] did not issue MAIL/EXPN/VRFY/ETRN during connection to MSA

My hosts file has this.

127.0.0.1       localhost.localdomain localhost
::1     localhost6.localdomain6 localhost6
192.168.4.254   myserver.mydomain.com myserver

Durwin:
I increased Sendmail log level and saw this.

Jan 31 09:56:58 bayou sendmail[1207234]: 00VGuwxX1207234: AUTH failure (GSSAPI): generic failure (-1) SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure.  Minor code may provide more information (Key table file '/etc/krb5.keytab' not found), relay=localhos>

I saw GSSAPI and noticed it in sendmail.mc, so I removed it.  Now it works.  Something changed in Roundcube as this setting worked in previous versions.  But, I don't even know what GSSAPI does anyway.  I've had that setting in Sendmail for years.

Thank you,

Durwin

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