I searched but did not find this topic, my apologies if it has been covered before. Sometimes, not always and infrequently, I will reply to an email that I receive on my iPhone 4, iOS 5.01, and I receive and an error message that relaying is not supported. I have never had the same problem on my Mac. The incoming email accounts vary from earthlink, yahoo, company email accounts, etc., and are all email accounts from folks who frequently email me. My outgoing emails are on accounts that I control on a VPS. The randomness of the problem has me stumped. Any thoughts?
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Post-Script: I have AT&T service.
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Post-Script: I have AT&T service.