As the smarthost configuration is identical on both of these servers, I doubt that it's my ISP's mail server. I have even tried with /SECURITY=none as suggested within the courier-mta documentation.

The <user> and <pass> details used to log in to my ISP's mail server are my own, and they work on the server.

But the telnet results:
220 smtp.ains.net.au ESMTP
EHLO tcl.homedns.org
250-smtp.ains.net.au
250-PIPELINING
250-8BITMIME
250 SIZE 20000000

Doesn't give any clear suggestion as to what flavour of SMTP it's running as far as I can tell.

Sam Varshavchik wrote:
Tim Lyth writes:

When I enable the smarthost line, any email sent out is immediately DSN'd back stating:

<<< Compatible SASL authentication not available.

As the error message says, your smarthost does not support any SASL authentication methods that are supported by Courier.

What needs to be fixed, and how do I do it? (other than disabling smarthosting...)

Determine what SASL authentication methods are advertised by your selected smarthost. Since courier-authlib implements most common authentication methods out there, the only possibilities are:

1) Your smarthost does not support authenticated SMTP at all, either it's misconfigured or you're using the wrong smarthost

2) Your smarthost is some commercial mail server, like Exchange, which has been configured to support only proprietary MS authentication schemes.

In any case, this is pure speculation until you telnet to your smarthost's port 25 and see what authentication methods it claims to support.


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