Relaying is what SMTP essentially does. (Work with me for a second
people...) And Joe there wants to send an email. It's coming from his
computer on some external network I imagine, and going out to some other
completely different network through YOUR server. At least, it's trying to.
If he could do it, what's to stop Rob at AOL, who isn't a client on your
server, from doing the same?
In a nutshell, you need to either select hosts you want to 'relay for' beit
other SMTP servers, incoming areas, or clients such as Joe there trying to
send an email to his mom@???. Exim should at least recognize one end
of the From: To: as relating, either by the host sending or receiving, or by
the user@domain sending or receiving.
So, there's two methods.
Either by <IP || [[host[.domain.tlc]>, or user[@[host.]domain.tlc];
a> You can allow his IP, his IP block, his host, his domain, etc through
b> You can allow anybody with an email account on your email server to send
to anybody, and likewise receive from anywhere.
The B option severely suggests you use some form of SMTP authorization,
otherwise anybody would be able to send emails to anybody through your server
assuming the identity of any username on your server, and Exim would
otherwise gladly relay the email and put you in the doghouse for everybody
who's pestered. This method is *constantly* used by various Outlook viruses
to migrate between networks whilst covering it's tracks. (Malicious)
Anyway, I hope that clears things up for you.
On Friday 18 October 2002 17:34, you wrote:
[] I have a client who can recieve but not send email. he gets an error
[] "Unknow error has occurred. no error number" when trying to send email.
[] my rejectlog reads
[]
[] refused relay (host) to <some@???> from <client@???>
[] H=188.philadelphia-23-24rs.pa.dial-access.att.net (jre) [12.90.9.188]
[]
[]
[] what in the world does that mean? the client was only trying to reply to
[] an email. why is it trying to relay it?
[]
[] Tony VanScoy
[] Systems Administrator
[] Certified Solutions Inc.
[] 1205 Scott Street / Wilkes Barre, PA 18705
[] (570) 822-0789 /
www.certifiedsolutionsinc.net
[]
[]
