Howdy,
I've been noticing an increasing amount of messages like this in my
sendmail log:
Aug 15 05:01:35 mailserver sendmail[13287]: k7EJ1YE7013287:
SYSERR(root): localhost.fabulous.com. config error: mail loops back to
me (MX problem?)
I couldn't back it up with statistics, but I'd swear there's an
explosion of this kind of thing (DNSing a domain's MX to be '127.0.0.1'
or similar) happening at the moment - noticing a lot of it in my logs,
anyway.
Do people actively combat this somehow?
I was thinking it would be nice to have a mechanism whereby mail with an
envelope domain whose MX was DNSed as localhost was rejected in the SMTP
conversation (or perhaps discarded by SA during its checks).
Thanks,
Guy.
