From: john on
I understand that setting "smtp_sasl_auth_enable" to yes, enables sasl
authentication in the SMTP client, but does it make it mandatory.
If I do not have an entry in the sasl password list for a particular
smarthost/relay will I have a problem.
TIA
JLA

From: Patrick Ben Koetter on
* john <john(a)klam.ca>:
> I understand that setting "smtp_sasl_auth_enable" to yes, enables
> sasl authentication in the SMTP client, but does it make it
> mandatory.

It makes it mandatory only for hosts listed in a sasl password map.

> If I do not have an entry in the sasl password list for a particular
> smarthost/relay will I have a problem.

If you want to relay and the host requires SMTP AUTH and you don't AUTH, then
yes.

If you just want to send messages to any other host, no.

p(a)rick

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saslfinger (debugging SMTP AUTH):
<http://postfix.state-of-mind.de/patrick.koetter/saslfinger/>