email is being blocked by old spamhaus record

IniobongNkanga-8038 681 Reputation points
2024-10-21T19:00:22.4333333+00:00

Hello

Please i need your help on this issue.

One of our business partners is unable to reliably send us email because of an outdated Spamhaus listing. The host was removed from the Spamhaus email block list on October 4.

This is the reject message: host -HK.MAIL.PROTECTION.OUTLOOK.COM[ ] said: 550 5.7.1 Service unavailable, Client host [ ] blocked using Spamhaus.

To request removal from this list see https://www.spaAS(1450) [MN...

Microsoft Exchange Online
Outlook
Outlook
A family of Microsoft email and calendar products.
4,016 questions
Microsoft Exchange
Microsoft Exchange
Microsoft messaging and collaboration software.
566 questions
0 comments No comments
{count} votes

1 answer

Sort by: Most helpful
  1. Jake Zhang-MSFT 6,615 Reputation points Microsoft Vendor
    2024-10-22T02:47:22.9466667+00:00

    Hi @IniobongNkanga-8038 ,

    Welcome to the Microsoft Q&A platform!

    Based on your description, I understand the frustration of email delivery issues. It seems that although the host has been removed from the Spamhaus blocklist, your business partner is still experiencing issues. There are a few steps you can take to resolve this issue:

     

    1. Double-check that the IP address in question has indeed been removed from all Spamhaus blocklists. You can use the Spamhaus IP and Domain Reputation Checker to confirm this.
    2. Keep in mind that changes to blocklist status can take some time to propagate. Although the host was removed on October 4, it can take up to 24 hours for the change to be reflected in all systems.
    3. The email server may have cached the blocklist information. In this case, restarting the email server or clearing the DNS cache may help.
    4. Make sure the IP address is not listed on any other blocklists that may be causing the problem.
    5. Make sure your business partner's emails are properly verified with SPF, DKIM, and DMARC. This can increase the deliverability of your emails and reduce the likelihood of them being marked as spam.
    6. Keep a close eye on your email traffic to ensure there is no unusual activity that could trigger spam filters.

     

    By following these steps, you should be able to identify and resolve the issue that is causing your emails to be blocked.


    Please feel free to contact me for any updates. And if this helps, don't forget to mark it as an answer.

    Best,

    Jake Zhang


Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.