[dns-operations] can anybody think of what antispam purpose this RRset might be serving

[Florian Weimer]

* Paul Vixie:

> colour me puzzled.  rrset ttl's are minimized by compliant
> initiators, so the MX RRset here has ttl 0.  but maybe there's
> spamware or malware out there that doesn't respect this, and this is
> the indirect way i'm hearing about it?

If you ask the other name server, both RRs have got TTL 0.  Looks like
a misconfiguration to me.