Postfix SMTP authentication to another MTA?

[jahanjoon]

Happy New Year to All,

Need some guidance and help on the following please:

I have configured a new EFA to be able to do a better job of what my hosting provider is doing for a domain/email I use. The EFA is working fine with forwarding to my Exchange Servers but when emails that are destined for the host at 209.xxx.xxx.xxx (which is Exim I believe) go via EFA they get bounced as per below message:

<test@mydomain.com>: host 209.xxx.xxx.xxx[209.xxx.xxx.xxx] said: 550-Please turn on
SMTP Authentication in your mail client. 550-mxb.zoolander.com
[51.xxx.xxx.xxx]:39232 is not permitted to relay 550 through this server
without authentication. (in reply to RCPT TO command)

I have tried following some guides such as http://postfix.state-of-mind.de/patrick ... rvers.html or http://linuxgazette.net/142/pfeiffer.html but these may not be relevant or I have not followed the right path...

As always, thank you in advance for reading this and your help will be most appreciated.

[e-d-i-t]

I have the same issues...
For days now I am trying to get back to EFA, but I need to do SMTP AUTH to my external smarthost ...

First I thought SASL was needed, but it seems to be something else.
My external smarthost is set to : somesmarthost.com:587
Cause I need to bypass port 25 which is blocked by default by ISP.

SASL OFF:
status=bounced (host xxxxxx said: 554 5.7.1 Recipient address rejected: Authentication required (in reply to RCPT TO command))

SASL ON:
Feb 17 15:42:59 smtpgtw postfix/smtp[13529]: warning: SASL authentication failure: No worthy mechs found
Feb 17 15:42:59 smtpgtw postfix/smtp[13529]: 7427F340068: SASL authentication failed; cannot authenticate to server xxxxx : no mechanism available

[shawniverson]

http://www.postfix.org/SASL_README.html