On Wed, Mar 27, 2019 at 02:40:36PM -0700, James Moe wrote:

> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-sma-inc.us we trust you 
> sma-station14l.sma.com
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-DSN
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-SIZE
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-AUTH LOGIN PLAIN CRAM-MD5 DIGEST-MD5 
> GSSAPI
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-NO-SOLICITING
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-8BITMIME
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250-HELP
> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: < 
> mail.sma.com[192.168.69.246]:5025: 250 EHLO

The server offers multiple SASL mechanisms, including GSSAPI.

> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: 
> smtp_sasl_authenticate: mail.sma.com[192.168.69.246]:5025: SASL mechanisms 
> LOGIN PLAIN CRAM-MD5 DIGEST-MD5 GSSAPI

The client's SASL library supports multiple mechanisms, including GSSAPI.

> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: GSSAPI client 
> step 1

The SASL library chooses GSSAPI

> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: warning: SASL 
> authentication failure: GSSAPI Error: Unspecified GSS failure.  Minor code 
> may provide more information (No Kerberos credentials available (default 
> cache: DIR:/run/user/51/krb5cc))

despite lack of GSSAPI credentials, and fails.

> 2019-03-27T14:16:57-0700 sma-station14l postfix/smtp[19939]: connect to 
> subsystem private/defer

Try:

    http://www.postfix.org/postconf.5.html#smtp_sasl_mechanism_filter

    smtp_sasl_mechanism_filter = plain

-- 
        Viktor.

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