[Mimedefang] sending relay has no MX record?
Kevin A. McGrail
kmcgrail at pccc.com
Sat Jan 29 19:35:36 EST 2005
I believe an MX was designed as a Mail Gateway record for machines not
directly connected to the network. Therefore, since an A record is for
machines that are connected to the network, an A record should be enough to
allow for mail to be delivered.
I know in practice that using only an A record works and is frowned upon. I
also know that an MX record has been expanded more and more. But from an
RFC perspective though, I'm not sure it's "incorrect" to just use an A
record without an MX record. Hopefully someone else can comment but in the
meantime, I'm not sure it's a legitimate test for spaminess.
Sincerely,
KAM
> Am seeing some spam where the sender's From_ address's domain
> doesn't have an MX record. Was considering noting that fact
> in the header as an extra X- field, and then letting SA score
> it negatively. Has anyone tried that sort of thing? Can
> you offer some prototype code that does something like that?
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