(Dedicated Linux Enterprise ES w/Qmail)
For some reason, when I send an email through my server or if an email is sent to a domain on my server, there is a 10-30 minute lag time.
I have ran MANY tests and the odd thing is when I view the email headers - it shows the email was received within a fraction of a second of when it was sent (many tests show this).
I have a theory as to what is going on.. but not sure exactly how to confirm/locate/check.
About 2 weeks ago my hosting company found out they setup my dedicated server w/out the RAID I specified - so they needed to setup a new server for me. Orginally they wanted to just setup the new server and have me reinstall my software, set things up, etc. But I told them that was not acceptable... so what they ended up doing is creating the new server and then doing an rsync from old to new - so the new server would have all the files from the old server.
Now, to do this they had to add an extra nic card to the new server (with a couple new ip addresses) this way I could keep my ip addresses and they could perform the rsync (after the transfer they removed the extra nic card).
Anyway, my problem started to happen around this time. (I wasn't aware of it until recently when I was on the phone with someone and sent an email to them... but they didn't get it for over 30minutes).
I'm wondering if the server is trying to resolve a domain/ip and is having a heck of a time... which could possibly cause the lag time.... cause according the email headers... the server receives the email a split second after it is sent.
I never had a problem until we were switched to the new server.
Anyone have a clue as to what the problme might be.. or what I could check?
This issue is only happening with email on the server. All the domains on the server respond just fine.