Undeliverable E-mails

60 pts.
Microsoft Exchange
Small Business Server
Occasionally my users will come to me and tell me that they have received the following message after trying to send an e-mail to someone: Your message did not reach some or all of the intended recipients. Subject: Room 200 Grill/ Diffuser Sent: 2/7/08 10:21 AM The following recipient(s) could not be reached: Mousam Adcock (mousam@acock.com) on 2/7/08 10:21 AM You do not have permission to send to this recipient. For assistance, contact your system administrator. <mock03.MockWoodworkin2.local #5.7.1 smtp;550 5.7.1 Requested action not taken: message refused> It may be that the e-mail my user attempted to send was the first time they had tried to communicate with the recipient, but I can't be certain of that at this point. I am running Exchange on a Windows 2003 Small Business Server, and hosting our internal e-mail on that system while using an ISP which his hosting our domain (and web site) for all external e-mail. To my knowledge I do not have anything configured that would restrict or prevent my users from sending messages to anyone. My question is two-fold.
  1. What is going on that is causing my users to get this message?
  2. Is there anything that I can do to prevent it?

Answer Wiki

Thanks. We'll let you know when a new response is added.

Is the recipient a local user, or a remote user. If it’s a remote user, then the administrator at the other end is blocking the email for some reason.

if it is remote then mrdenny is correct, the end recipient system is blocking email from your domain for some reason.

just to ask, does your ISP for your internet connection that your email server is using allow you to have a static IP address that your email goes out through? if not then more than likely your IP address has been added to the SBL, (SpamHaus Block List). this is only because it is a DHCP address. If you do get your IP address from DHCP then you can go to their website, and go to the delisting procedure link to have your IP removed from the list.

if you have a static IP you can still go to the site to check to see if it is on the SBL list or any of the other two lists that SpamHaus uses.


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  • lewisdale
    The recipient is a remote user.
    60 pointsBadges:
  • BB
    Before you start chasing your tail all over the place make sure they are good emails. Send something to the email accounts in question yourself. Connect via telnet, if you can't then you are probably being blocked. If you can connect via telnet and you just get an error when you enter the email address. Then the email address probably not any good.
    165 pointsBadges:
  • lewisdale
    Thanks for the information. I checked spamhaus.org and found that our ISP is on their list. Is there anything that I can do to fix the problem, or do I just need to live with it?
    60 pointsBadges:
  • Christine Herbert
    We ran a tutorial a while back on how to get off spam blacklists that you may have been unintentionally added to. It's called "Tutorial: How to protect Exchange Server from spam blacklists" but it really should apply to any mail server situation. Good luck. I hope this helps you solve your problem.
    415 pointsBadges:

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