They should be reported to rfc-ignorant.org. Definitely their problem.
The better MTAs detect the too-common broken "MX ip.ad.re.ss" record and interpret the intent of the error and try to deliver the IP, rather than not deliver the mail at all, while logging an "invalid MX record". Here's how postfix logs it:
Warnings
smtp (total: 315)
16 numeric domain name in resource data of MX record for netnet.co... <<<<<<<<
9 malformed domain name in resource data of MX record for altavis...
9 numeric domain name in resource data of MX record for con.net: ...
9 valid_hostname: empty hostname
8 no MX host for goodprods.com has a valid A record
8 numeric domain name in resource data of MX record for zeronet.n...
6 numeric domain name in resource data of MX record for 371.net: ...
5 numeric domain name in resource data of MX record for edtrain.c...
4 host nullmx.domainmanager.com[0.0.0.0] replied to HELO/EHLO wit...
4 host nullmx.domainmanager.com[0.0.0.0] greeted me with my own h...
4 no MX host for be-lax.com has a valid A record
4 numeric domain name in resource data of MX record for ynmail.co...
3 no MX host for freehongkong.com has a valid A record
3 no MX host for freenation.net has a valid A record
3 no MX host for bigprods.com has a valid A record
3 numeric domain name in resource data of MX record for reoworld....
3 numeric domain name in resource data of MX record for blocksp.c...
3 numeric domain name in resource data of MX record for fth.com: ...
3 numeric domain name in resource data of MX record for daspr.com...
2 host mail.hexi.de[0.0.0.0] replied to HELO/EHLO with my own hos...
2 host mail.hexi.de[0.0.0.0] greeted me with my own hostname MX2....
2 no MX host for utornto.ca has a valid A record
2 no MX host for wwwbc.com has a valid A record
2 no MX host for 2bsure.com has a valid A record
2 no MX host for pplmail.com has a valid A record
2 no MX host for phone.net has a valid A record
2 no MX host for chinaxian.com has a valid A record
2 no MX host for bimamail.com has a valid A record
Len
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