[NTLUG:Discuss] SMTP authentication question

[Chris Cox]

Daniel . wrote:
> I want to configure my SMTP server (internal to my LAN) to send all 
> outgoing traffic to another SMTP server out on the net.  The problem is 
> the outside SMTP server requires user authentication.  How can I get 
> sendmail to send all outbound SMTP traffic to another SMTP server with 
> authentication?  I haven't yet found any documentation on this.  Is it 
> possible with the current version of sendmail?
> 
> Clients are good about being able to supply authentication, but what 
> about another server?

http://www.sendmail.org/~ca/email/sm-812.html#812AUTH

I have not tested this out.  I switched to postfix.
You can find similar stuff for postfix in their faq.