I've setup email server using Slackware 12 and squirrelmail as my email server software. I also install webmin to manage the server.
My problem is i cannot sending out my email to other domains using outlook express.
The error message is;
The message could not be sent because one of the recipients was rejected by the server. The rejected email was 'email@domain.com'. Subject 'test'. Account: 'domain.com'. Server 'domain.com'. Protocol: SMTP, Server response: '550 5.7.1 <email@domain.com>... Relaying denied. IP name lookup failed (1.1.1.1)', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79
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