At 20:56 1/13/2004, Dustin C. Hatch wrote:
>by relay, do you mean open their client, set mail.mydomain.com as smtp
>and send messages?


Relaying mail means that a host can send mail through your server without 
restriction.

If the host is a local host (ie. under your control), this may be a good 
thing - as it means they can send mail to anyone they choose.

If the host is not a local host (ie. is not under your control), this is 
likely a bad thing - it's one of the means that spammers use to send out 
their email.

However, it is not necessary for local users' IP addresses to be listed in 
smtprelay.tab, as their mail clients can usually provide authentication to 
the server (ie. they set their mailbox user name and password in their mail 
clients, and tell it to authenticate when sending mail as well as when 
receiving mail).

The only time it's really necessary to list addresses in smtprelay.tab is 
for local host machines which are not capable of authenticating when 
sending mail - the most common example is a web server that has to generate 
emails (such as order confirmations). Web pages typically aren't set up to 
authenticate to your mail server when sending their emails.


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