The most likely cause for unrouteable email domain error is exceeding the hourly email sending limits (100/hour/domain) for all shared hosting accounts. If that's not the cause and you believe you are still within your limits, submit a ticket to our support team and a system admin will look into it for you.
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Your email address is very important in our systems. It is the piece of information that we use...
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If you are having problems sending email from your site, this is an easy script to help you...
There's very little you can do about email spoofing however you can fight back with Sender Policy...
