hi,

i setup sendmail and qpopper into my redhat box ...

i can receive email from others correctly ...

but i cant send email using my domain ...

the error message is like the following: ... any idea how to solve the problem ???

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'sw_76@yahoo.com'. Subject 'test from linux', Account: 'mail.studylinux.com', Server: 'mail.studylinux.com', Protocol: SMTP, Server Response: '550 5.7.1 <sw_76@yahoo.com>... Relaying denied', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

FYI, i have set up the MX record ...

thank you

The reason you are getting that error is because you have relaying closed. (Which is a good thing, it stops people from using your box as a spam depo :)

I suggest taking a look at POP Before SMTP: http://popbsmtp.sourceforge.net/

You need to enable SMTP authentication within Outlook. I.e. your outgoing server requires authentication.

Jasan:

any idea how to open this relay ???

Honestly you don't want to open it up 100% , That would just make your box into a giant piece of Spam, and leave a very bad aftertaste..

The url below gives you a walkthrough on how to install pop-before-SMTP on your box. It will allow you to send out e-mail but also stop any spammers from using your box.

http://www.iecc.com/pop-before-smtp.html

There are lots of resources on this subject.