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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You can access your email using IMAP or POP3 protocols. Your login is: username@domain.com...
Open Outlook. From the Tools menu, select Email Accounts.The Email Accounts box appears. Verify...
There's very little you can do about email spoofing however you can fight back with Sender Policy...
