Why Mailbox Providers Block IP Addresses?

Before you set out to get the error, you should know why the error happens. It's also important because you have to research to pinpoint the mistake that resulted in your IP address being blocked.

Following are some of the reasons for getting your email IP address blocked by Hotmail.

> Your email volume is changing at a speedy pace.
> You have misconfigured your DNS.
> Your email bounce rate is high.
> Your IP address has a bad reputation.
> Your email is being listed as spam by varied Hotmail users.
> Your IP address has transmitted high-level spam emails to Hotmail users.

Check Hotmail/Outlook IP Blacklist

First, ensure that the mailbox provider has blacklisted your IP address. If not, then the cause why your emails are running into spam folders is something else.
If Hotmail has blacklisted the IP, then you will get a message like the following:
"If you receive a no bounce notice, then it means that your email is delivered but went into the spam folder. But this doesn't mean Hotmail has blacklisted it. It's for some other reasons."

Once you get the above message, you should blend up for the IP blacklist elimination process. Then do the following things.

Find the Problem

The first thing you require to do is detect the problem. You can find the error inside of the server logs. Inside the server logs, you have to check the following strings:

list (S4205)

It would be best to find the initial block to see when the first occurrence of Hotmail was blocking your IP. Once get it, check for any unusual activity before 24 to 48 hours. Spammers will immerse the mailbox with spam information from a settled account. Further, look for unnecessary login trials. It helps you in locating the problem.

Examine the Sender Reputation

Next, you need to check the sender's reputation. For this, you have to use the sender reputation lookup tool, and if the score is below 85, it may affect the performance.

Check for Email's Authenticity

As a final step, you should check for the authenticity of the email. And check for PTR, DMARC, and DNS record of an email.

Present the Hotmail Blacklist Removal Form

Must submit a Hotmail Blacklist Removal Form once you've installed the email delivery question. It must include the bounce copy and header in the form. It will get around between 24 to 48 hours for Microsoft to modify your email IP address. You will be able to send messages as usual when the issue resolved.

A protective measure into your IP address becoming blacklisted is enrolling on the Junk Mail Reporting Program. It would notify you whenever someone flags your email as spam.

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