On Sep 15, staf wagemakers ([EMAIL PROTECTED]) wrote: > On Fri, Sep 15, 2000 at 02:14:49PM -0400, John Ackermann wrote: > > In message <[EMAIL PROTECTED]>, staf wagemakers writes: > > > > >You could add the next line to your /etc/mail/sendmail.mc > > > > > >FEATURE(accept_unresolvable_domains) > > > > I regularly see "domain must resolve" messages in my logs, usually from > > random sites Out There. Is there a significant security/spam risk in > > accepting unresolvable domains? I have the antispam stuff (no relaying, > > etc.) turned on in my sendmail.mc already. > > Normally you don't want to accept mail from non-valid domains, all from > addresses should have a valid internet address. I don't think your mailserver > get a open relay by enabling this "feature" but I wouldn't use it on a > mailserver that is connected to the internet. > > You can't reply to message because it comes from a non-existing domain, so > why would you waste time to read it :)
I agree with all of the above, but have an answer to the last question :-) If you are retrieving mail from your ISP via fetchmail and sendmail, presumably the domains were resolved by your ISP's MTA. So, why bother resolving them again? I get mail this way on my laptop, and I don't want to have some message not delivered to my laptop because the sender's domain temporarily cannot resolve. -- Neil L. Roeth [EMAIL PROTECTED]
