Re: [tlug] mail(): Received (may be forged) question

[Jonathan Q <jq@example.com>]

On Monday 07 April 2003 12:53, Jean-Christian Imbeault wrote:


> Don't ask me. I just do the back end programming ... or more precisely 
> *did* until I also got stuck with the sysadmin stuff too when the admin 
> left 

Hey, I'd love to go back to Japan.  Need an admin? :-)

> > tokyo-av-land.com nor tokyo-avland.com have an MX record:
> 
> They are not supposed to. We only use the one domain name, 
> tokyo-avland.co.jp, the others were taken "just in case" and point to 
> tokyo-avland.co.jp.

> I'm a bit lost here. Are you in my zone files I can set the MX record to 
> point to my SMTP machine, even if the SMTP machine has no relationship 
> whatsoever with the domains in question?

More or less, yes.   The easy way to handle it would be to configure the SMTP 
box to accept mail for any domain which has an MX record pointing to the SMTP 
box, then give all of the domains such an MX record.  Then, configure it to 
deliver all mail to the "just in case" domains to the postmaster address for 
those domains, and to deliver that postmaster address in turn to 
postmaster@example.com  If mail is accepted at all, postmaster must 
be reachable, of course, per  RFC 2821:

   Any system that includes an SMTP server supporting mail relaying or
   delivery MUST support the reserved mailbox "postmaster" as a case-
   insensitive local name.

If an MX is configured to refuse all mail, postmaster becomes effectively 
optional.  If you're interested in knowing more about that, grep for 554 in 
RFC 2821, and you'll know it when you see it.

Jonathan
-- 
Jonathan Q
GPG key ID: ACC46EF9 (E52E 8153 8F37 74AF C04D  0714 364F 540E ACC4 6EF9)
To get my public key: gpg --recv-keys --keyserver pgp.mit.edu ACC46EF9

Attachment: pgp00017.pgp
Description: signature