How to Delete Your IP Address From Hotmail/Outlook


You’re excited to send a business proposal to your clients, so you wrote one with zeal. You received a beak notice from Hotmail/Outlook with an error message soon after sending the email. You may be baffled as to why your mail server’s IP address is mentioned in the Hotmail/Outlook blocking list if you didn’t spam. You can get let go of your IP address from the Hotmail/Outlook blacklist by having to fill out the Sender Required information.

Why was your IP blacklisted by Hotmail/Outlook?

Hotmail/Outlook removed an unusual or suspicious activity from your server, this happened. To be more specific, these activities may include:

  • The spam was reported against your IP by a Hotmail/Outlook user.
  • You may be sending the email from a different IP address.
  • From your IP address, there’s a chance you’ll get a lot of spam-looking mails.
  • Your email bounce rates are very high.
  • The number of emails sent from your IP changes often.
  • Due to a DNS misconfiguration, your email authentication is failing.
  • Another option is that you’re sending emails to people you don’t know.

Unrequested or spam emails are blocked by the Hotmail/Outlook mail service, which keeps an eye on illegal senders and receivers. This is critical to safeguard users from spammers and other hacker operations.

If your email service provider finds such activity, it will ban you severely.

How can you remove your IP address from the Hotmail/Outlook blacklist?

You must fix the exact reason before submitting the request to remove your IP from the Service provider blacklist. If the problem which caused the block is solved, Hotmail/Outlook will immediately remove your IP address from the blacklist.

If you attempt to submit the removal request form before resolving the problem, your IP will be subjected to an extra screening procedure, further complicating the situation.

How to get your IP address off the Hotmail/Outlook blacklist

Method 1: Finding Error

To figure out what’s wrong, you’ll need to look at the server’s log. The following string may be creating issues, resulting in a return.

list (S3150)

These bands in the server log usually cause Hotmail/Outlook to blacklist your IP address. After you’ve found such text, you can do the following:

  • Check to see when Hotmail/Outlook blocked or rebounded your emails for the first time.
  • Investigate the emails from the time the first blockage happened until the next 24 to 48 hours.
  • In emails, you should look for any unusual or malicious activity.
  • Check for excessive login with username and password using the email statistics tools.
  • If your account had been hacked, you might well notice a sudden increase in inactivity.

Spammers are always on the lookout for compromised accounts to flood mailboxes and cause spike inactivity. One of the major reasons for Hotmail/Outlook blacklisting is a security violation.

Method 2: Analyze the Sender’s Score and Reputation

In contrast to disclosing filtering policies, Microsoft prefers the Return Path. Return route has an advantage since it offers a variety of services, including email delivery, whitelisting for high-volume senders, and a variety of additional paid services.

You may remove IP addresses from the Hotmail/Outlook blacklist by measuring sender reputation.

The Return-path also gives the sender score, which is a sender reputation measure that suggests that if the score is more than 85, email delivery will be smooth. However, a score of less than 85 will have the same effect.

Method 3: Authentication via Email

For email authentication, Microsoft looks at the SPF and DKM parameters. While sending an email to Hotmail/Outlook subscribers, sender ID authentication is required.

You should be using a tool to ensure that your email authentication is functioning.

Additionally, you may utilize PTR, DNS, and DMARC records to guarantee email authentication.

Method 4: Hotmail/Outlook Postmaster Services

Registering with Hotmail/Outlook Postmaster services will enable you to send trouble-free high-volume emails to these service providers. This method will ultimately let you remove IP off the Hotmail/Outlook blacklist. </ Enrolling your IP address in the Postmaster services is recommep>nded if you are sending a minimum of 100 emails a day to Hotmail/Outlook customers.

You may also register yourself in Outlook’s Junk Mail Reporting Program (JRP) to inform when any Hotmail/Outlook user detects your email as spam.

Method 5: Form for removing yourself from the blacklist

You may submit a blacklist removal request once you’ve worked out a solution to the mail blocking problem. Now continue in the following direction:

To remove IP from the Hotmail/Outlook blacklist, click the Blacklist Removal Form Link and fill out all of the required information.

  • Copy and paste the bounced message into the form, including the headers.
  • Microsoft will need to examine the headers to validate the problem and IP.
  • You may anticipate the notice letter in a few hours.
  • You will get their email within 48 hours for consideration of mitigation or not.
  • The email ban will be lifted in 24 hours if the answer is affirmative.
  • If the response isn’t to your liking, you may request further information by responding to the same email.
  • A dedicated Hotmail technician will assist you in resolving the problem.

Hotmail Blacklist Bounce Codes

You will get a code representing the nature of the problem in every Hotmail blacklist bounces report. You may go through the list of codes to find out what they mean. After you’ve resolved these issues, you may delete IP addresses from the Hotmail/Outlook blacklist.

We’ll go through a few of the codes here.

421 RP – 001When the IP Mail server trying to connect to Outlook exceeds the allowed rate limits, this error occurs. The reason for this is the reputation of the IP domain, and you will need to seek assistance from the service provider.
421 RP – 002This error code indicates that the maximum rate limit ALLOWED ON THIS CONNECTION has been exceeded by the Outlook Mail server IP. To get your IP removed from the Hotmail/Outlook blacklist, you’ll need to contact your service provider.
421 RP – 003Due to IP/Domain reputation, the Outlook connected mail server IP has surpassed the connection limit. If you’re not an administrator, get in touch with the service provider.
550 SC – 001The cause for denial is spam-like features in the message. The email bounced due to policy considerations.
550 SC – 002The Outlook connected mail server IP displays namespace mining behavior
550 SC – 003The IP address that shows as a proxy or relay is the cause for mail rejection.
550 DY – 001The message from dynamic IP addresses was rejected by Outlook. Unauthenticated SMTP email is usually delivered to an internet mail server using such IPs.
550 DY – 002This error occurs when the email is sent from a computer that has been infected with a virus or malicious software.
550 0U – 001Due to spam-like features in the message, an error has occurred.

If you are not an email/ network administrator, then you will have to contact the service provider to resolve these issues and remove IP from the Hotmail/Outlook blacklist.


Let’s summarise. Before contacting the Microsoft techies, you must discover the real cause of the mail blocking problem. Further, you need to check that your sender’s score is above 85 and have your email verified.

Additionally, you may get Email Customer Support, if your need is sending more than 100 emails/day to the Hotmail subscribers. Now you can complete and submit the Blacklist removal form

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