Undeliverable: Delivery Status Notification (Failure) message

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Microsoft Exchange
Networking
Your message did not reach some or all of the intended recipients. The following recipient(s) could not be reached: You do not have permission to send to this recipient. For assistance, contact your system administrator. Client host rejected: Please use your ISP's SMTP relay! ANR00255> Thanks-

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Chances are that your public IP is assigned dynamically. Who is your ISP? Can you get a static IP from your ISP?

If you do not have a static IP check with your ISP to see if you can get one. If not you will need to use a relay server to send your email and your ISP may be able to provide you with that service.

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