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Common Errors
Microsoft Office 365 / Hotmail / Outlook delivers my email to the spam folder
Recipient at Office365/Hotmail/Outlook not receiving my emails
No Such Recipient Here
I’m forwarding to or retrieving email via POP3 at Gmail, and when I send a test email from the same address that will ultimately be receiving it, it doesn’t work.
Sender verify failed
550 Authentication Required
Failure to comply with SPF policy
Gmail forwarder not working
URIBL_BLOCKED in SpamAssassin headers