i am gonna go out on a limb and guess that you are on a shared server/ virtual host.. it could be several things if that is the case.. first, talk to your hosting provider and see if they are doing any kind of weird priority or queue based mail system.. also, have them look at the server logs and see if there are any issues with sendmail (or whatever the smtp mailserver happens to be).. there potentially could be all kinds of snags in the line, so to speak.. start with basics first.. make sure there is no queue/priority.. logs.. have them look to make sure there are no issues with port 25 on the server..
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