On Sat, Jun 24, 2006, doug campbell wrote:
I'm not at all sure that this is a non-issue for those of us using
sendmail (it's nice to know EXIM users aren't bothered by this). Neither
sendmail nor libmilter do the necessary step to verify correctness of
the rDNS result that they pass to my milter code as the "hostname"
argument of xxfi_connect(). Either sendmail or libmilter (whichever of
these provides the rDNS value passed to a milter) should be the ultimate
place where any modifications to add verity go. Other milter makers
As it has been pointed out before, sendmail does the "reverse" check
(for obvious reasons). You can access that information in your
milter, see the sendmail documentation (doc/op/op.*):
${client_name}
The host name of the SMTP client. This may be
the client's bracketed IP address in the form
[nnn.nnn.nnn.nnn] for IPv4 and
[IPv6:nnnn:...:nnnn] for IPv6 if the client's IP
address is not resolvable, or if it is resolvable
but the IP address of the resolved hostname
doesn't match the original IP address. Defined
in the SMTP server only. See also
${client_resolve}.
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