phpmailer - The following SMTP Error: Data not accepted

Question

I\'m trying to figure out this issue for 6 hours. But there is nothing to make sense. Here is the scenario; There is a well formatted HTML template.

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Answer 1

I was experiencing this same problem. In my instance the send mail was timing out because my Exchange server was relaying email to a server on the internet. That server had exceeded it's bandwidth quota. Apparently php mailer has some built in timeout and it wasn't long enough to see the actual message.