[CentOS] SPAM on the List
Devin Reade
gdr at gno.org
Mon Jul 18 16:41:55 UTC 2011
--On Sunday, July 17, 2011 10:37:53 PM -0400 Stephen Harris
<lists at spuddy.org> wrote:
> RFC2821 says:
> - The domain name given in the EHLO command MUST BE either a primary
> host name (a domain name that resolves to an A RR) or, if the host
> has no name, an address literal as described in section 4.1.1.1.
>
> So, pretty much, HELO or EHLO greeting _must_ match to an IP.
>
> (RFC821 actually wanted the HELO to match the connecting host, but
> 2821 just says it must be an A record or an address literal).
Thank you for posting that.
Despite the garden path we got down, my previous comments didn't say
that you had to accept *anything*, but merely that too stringent of a
check would eliminate some valid mailers. There's nothing like
stirring a can of worms :)
Devin
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