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I recently installed a RedHat Enterprise Linux system. I have sendmail, with cyrus being used for pop3 with outlook clients on my PCs.
The problem is that When I send emails from outlook to any external domains, I get 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 'firstname.lastname@example.org'. Subject 'Fw: Welcome to Outlook Express 6', Account: 'citygate.com', Server: 'citygate.com', Protocol: SMTP, Server Response: '550 5.7.1 <email@example.com>... Relaying denied', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
To test my install, I used Telnet to port 25. Using this connection, I successfully created and sent an email to an external domain. I also used the regular Linux mail command to send emails to external domains without any issues.
It appears that the problem only occurs if I am using outlook and I am sending to an external domain.
At this point I am pretty much baffled. Any suggestions would be greatly appreciated.
you have to switch this setting in every Outlook-Client.
Another possibility is to allow unauthenticated relaying on the server.
But this can result in mailing for spammers.
Or allow relaying for the localnet only.
Maybe this was the setting for your old server.
Tried to set the client to authenticate when sending emails. But it did not make any difference.
I can't belive this is such as difficult thing. I simply downloaded and installed Redhat and enabled sendmail to talk with external hosts per instructions on RH website, same as I did before with RH 8.
Any addtional thoughts would be greatly appreciated.