My settings
main.cf:
relayhost = [relay.dnsexit.com]:587
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
And my sasl_passwd file (and yes, I did do a postmap after my changes)
relay.dnsexit.com:587 myusername:mypassword
Your lookup key is missing the [ ] you used for the relayhost setting.
This results in no authentication to the dnsexit relay.
This is described in the section "Enabling SASL authentication in the
Postfix SMTP/LMTP client" of the SASL README file at
https://www.postfix.org/SASL_README.html#client_sasl_enable
--
Christian Kivalo
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