Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Is it possible the following error could cause emails to not be sent?

 warning: numeric domain name in resource data of MX record for

Our customer support department says there' been a huge spike in customers not receiving RMA emails. No code on the RMA site has changed at all, we haven't updated the production server. I'm showing about a 97% success rate on emails being sent from the server logs.

Any ideas on what I should look at to determine the cause?

share|improve this question
up vote 2 down vote accepted

An MX record should be a fully qualified domain name, not an IP address. Most clients will send to an IP address, but some won't. It's a simple fix, why take the risk? Just make sure you have a corresponding A record.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.