I think the question is can an SMTP server be set up so that it does not allow a user from one domain to route email to a user from another domain.
I think this is a reasonable question. The problem is that there are as many answers as there are SMTP mail servers. The answer for Exchange SMTP server is to route internally only. For Sendmail it is a ruleset that is invoked.
However, Pascal is correct when he states that I can telnet to YOUR SMTP server and send YOU a message and it will appear to have come from, oh, say, [EMAIL PROTECTED] :-) There is no good way to stop this... the messages was meant for you and SMTP has no way to verify that it didn't come from good ol' Bill.
Dan
-----Original Message-----
From: Pascal C. Kocher [mailto:[EMAIL PROTECTED]]
Sent: Wed, August 23, 2000 12:00 PM
To: '[EMAIL PROTECTED]'
Subject: Re: SMTP servers
Hi
> I've noticed that when I telnet to any mail servers on port 25, I can send
> email to anyone using SMTP commands. Is there a way to stop this?
No, unless you want to stop your mailserver receiving mail. This is the
standard SMTP communication between mail-servers.
Regards,
Pascal.
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