[courier-users] Sending Mail to a domain without an MX record????

[Gerardo Gregory]

I am looking for some clarity on an issue I am having from the list. 

Recently it has been brought to my attention that we where unable to receive 
mail from a specific domain [huskers.unl.edu to be precise].  After some 
troubleshooting I discovered that the domain huskers.unl.edu has an existing 
A record, but no MX record. 

After talking with [EMAIL PROTECTED] I also discovered that they where in 
fact receiving mail from us (even though my mailq still showed a deffered 
message).  When the [EMAIL PROTECTED] sent me the smtp error they where 
receiving from my server it stated that [DELIVERY FAILURE: Error 
transferring to mailq.AFFINITAS.ORG;
SMTP Protocol Returned a Permanent Error 417 DNS lookup failure:
huskers.unl.edu. Try again later]. 

I imagine this is to the lack of courier not being able to find a legitimate 
MX record for this domain.  As far as I can tell, none of the listed DNS 
servers for the University of Nebraska (public) have an MX record for this 
domain (NSLOOKUP proved that one quite easily). 

My question is how are they still receiving a message without a public MX 
record? 

Any ideas, suggestions, answers would be appreciated. 

Gerardo A. Gregory 



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