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:
- 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.
- 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.
- The email server may have cached the blocklist information. In this case, restarting the email server or clearing the DNS cache may help.
- Make sure the IP address is not listed on any other blocklists that may be causing the problem.
- 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.
- 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