Outlook and sendmail

How can I allow Outlook Express to send eMail through sendmail (FreeBSD 3.3) by SMTP ?

Actually, I got the following error :

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'user@domain.com'. Subject 'TESTING', Account: 'mail.mydomain.com', Server: 'mail.mydomain.com', Protocol: SMTP, Server Response: '550 <user@domain.com>... Relaying denied', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

Andrew
andrewyuAsked:
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andyalderCommented:
it's a generic SMTP message, you are sending mail to be relayed to a machine that has got relaying turned off (to avoid being used by spammers)
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andrewyuAuthor Commented:
How can I turn off the relaying ?

Andrew
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mnewnhamCommented:
1. It's probably better to set the domain of the Outlook clients to match the domain of the server.

2. Otherwise build your sendmail.cf with this:

FEATURE(promiscuous_relay).

 If you really want to forward all the spam on the net, this will turn off all checking for relaying.
 
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andrewyuAuthor Commented:
Does "FEATURE(promiscuous_relay)" mean that I can send email through this server everywhere ?

Andrew
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mnewnhamCommented:
Yes, but it also means that _anyone_ can use your server to relay mail. For example, if I wanted to spam 1,000,000 people from my system, I could connect to your server, deliver them to you and your system would deliver them for me. Your server would then be in the header for the messages.....
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andrewyuAuthor Commented:
I understand, but, some end-user need a notebook ready for this issue !

Anyway, thank you very much for your help !

Andrew
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mnewnhamCommented:
So can I have my points now please?
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andrewyuAuthor Commented:
Thank you very much !

I am so sorry that I cannot give you so much points !

Andrew
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