[Mimedefang] OT: DNS sanity check

[Les Mikesell]

Jason Gurtz wrote:
> On 7/4/2007 13:41, John Rudd wrote:
>> Let me guess: AOL is the refusing ISP?
>>
>> They've had this as a standard policy for quite a while.
> 
> Actually, their policy seems to still be (since about 2004 timeframe)
> reject only when there's NO ptr record.  Mismatched ptr/a records don't
> seem to cause a problem with them (tho obviously they should match).

You mean things like this:

nslookup mailin-03.mx.aol.com

   Name:   mailin-03.mx.aol.com
   Address: 64.12.138.153
   Name:   mailin-03.mx.aol.com
   Address: 205.188.157.217
   Name:   mailin-03.mx.aol.com
   Address: 64.12.138.120

nslookup 64.12.138.153
  153.138.12.64.in-addr.arpa      name = mg.mx.aol.com.
nslookup 205.188.157.217
  217.157.188.205.in-addr.arpa    name = yc.mx.aol.com.
nslookup 64.12.138.120
  120.138.12.64.in-addr.arpa      name = mf.mx.aol.com.

Does that fit the much-touted best practices model?

-- 
   Les Mikesell
    lesmikesell at gmail.com