giuliano--- via Postfix-users:
> Oct 31 19:23:44 host01 postfix/submission/smtpd[497262]: <
> unknown[2603:1056:c03:1c16::5]: AUTH LOGIN
> Z2l1bGlhbm9AaG9zcGVkYXF1aS5jb20uYnI=
The error is that Postfix will only accept AUTH PLAIN.
This is from the communication with Dovecot:
> xsasl_dovecot_server_mech_filter: keep mechanism: PLAIN
> sasl_mech_filter: keep SASL mechanism: 'PLAIN'
This is from the communuication with the remote SMTP client:
> unknown[2603:1056:c03:1c16::5]: 250-AUTH PLAIN
> unknown[2603:1056:c03:1c16::5]: 250-AUTH=PLAIN
Solutions:
- don't set sasl_mechanism_filer
- add 'login' to the sasl_mechanism_filer setting.
Wietse
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