Here are ways to improve delivery success:
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Make sure your messages contain all of the following: instructions on how to unsubscribe from your mailing list, non-Internet contact information for the sender (like phone number or address), the reason the recipient is receiving this email.
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Run your message through the junk mail scanner. Choose Message > Check Junk Mail Score...
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Send your message using either the SMTP server or e3 Delivery Service delivery method.