Submit a request for removing your mail server IP from Office 365 black list

In case that your organization experiences a scenario in which your mail server IP address appear in the Office 365 blacklist, and E-mail messages sent from your mail server is rejected by the Office 365 mail infrastructure (Exchange Online), you can use the Office 365 “delist portal”, which enable you to submit a request for removing your mail server IP address from the blacklist.

Regarding the major questions such as:

1. Can I be confident that my mail server IP address removed from the Office 365 blacklist?
2. What is the period required to remove the mail server IP address from the Office 365 blacklist?

At the current time, there is not a lot of information regarding this question and another question that relates to this issue.

The only think that can be assumed is that in case that our mail server IP address Registered mistakenly (false positive) in the Office 365 blacklist, there is high chance in which our request accepted, and taht the IP address removed from Office 365 blacklist

Just a short quotation from the O365 Anti-Spam IP Delist Portal

Please note that before submitting this request, it is the sender’s responsibility to ensure that any further mail originating from the IP in question is not abusive or malicious.

How to submit a request for removing my mail server IP address from the Office 365 blacklist?

• Access the following URL : O365 Anti-Spam IP Delist Portal (https://sender.office.com)
• Enter the required information such as your E-mail message and your mail server IP address.

Third-party block lists providers – Office 365

Third-party block lists

List Name	Delisting Portal
URIBL	https://admin.uribl.com/?section=lookup
SURBL	https://www.surbl.org/surbl-analysis
Spamhaus	https://check.spamhaus.org/
Invaluement	https://www.invaluement.com/lookup/
Phishtank	https://www.phishtank.com/