Sander Holthaus - Orange XL writes:
When going through my maillogs, I noticed various 546 Routing loops. Upon a
closer look, it appears that several bulk-mail domains have
DNS-(A/MX)-records that point to 127.0.0.1, which can cause the
beforemetioned routing loop.
Is this a fault from my part (error in my courier configuration)? If not, is
there any way I can refuse mail from domains that resolve to 127.0.0.1
without breaking anything? Doesn't pointing to reserved, private, etc. IPs
in (public) DNS-records violate an RFC?
I'm not aware of anything that technically prohibits such an MX record.
But they can be easily stopped. You must enable BOFHCHECKDNS, and put "badmx 127.0.0.1" in the bofh file. The man pages give more information.
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