Jeff Jansen writes:
Looks like you fixed it, whatever you did.
[EMAIL PROTECTED] jeff]$ telnet 24.17.224.197 25 Trying 24.17.224.197... Connected to 24.17.224.197. Escape character is '^]'. helo domain.com 220 mail.agarithil-nost.com ESMTP 250 mail.agarithil-nost.com Ok. mail from:<[EMAIL PROTECTED]> 250 Ok. rcpt to:<[EMAIL PROTECTED]> 513 Relaying denied.
Now just make sure any "roaming" users have authenticated SMTP enabled in their mail clients and you're set to go. (I'd also make sure they using encryption, especially if they use LOGIN or PLAIN authentication.)
I suspect that he had a NAT firewall which forwarded all incoming port 25 connections to his server.
Naturally, everyone who would connect to the server would have, from the server's perspective, the firewall's IP address, to which he granted relaying privileges.
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