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Re: BCP for handling DNS SERVFAIL results

2005-11-26 01:10:43

ned+ietf-smtp(_at_)mrochek(_dot_)com writes:
But this doesn't mean that you should do this: Nothing prevents someone from having an MX for pointing to a completely separate while having a SMTP server running on that silently eats everything sent to it. And yes, such a setup would be stupid and dangerous, but people do stupid and dangerous things all the time.

I've seen this exact setup, in two varieties. IN A
                          IN MX 0

Who knows what you might reach at

The other variety has a proper IP addres for workstation15, and workstation15 runs a vendor-standard SMTP server, delivering to somewhere that noone ever reads.

I agree with Ned: Don't fall back to A unless you know there's no MX.