Cadzow Knowledgebase

Contact Us

Site Search

Remote Support

Print Friendly

Delivery Failure to Outlook/Live/Hotmail Accounts

If your mail server's IP is added to a block list, you may receive delivery failures similar to the following when sending to Outlook/Live/Hotmail mailboxes:

Subject: Undeliverable: Test Message rejected your message to the following e-mail addresses:

[email protected] ([email protected]) gave this error:
Unfortunately, messages from [a.b.c.d] weren't sent. Please contact your Internet service provider since part of their network is on our block list (AS3150). You can also refer your provider to []
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.

To resolve:

Copyright © 1996-2023 Cadzow TECH Pty. Ltd. All rights reserved.
Information and prices contained in this website may change without notice. Terms of use.

Question/comment about this page? Please email