Here is How You Fix the ‘550 Permanent Failure Blocked’ Email Error

Here is How You Fix the ‘550 Permanent Failure Blocked’ Email Error

Email errors are frustrating for the end users who do not have much technical expertise. There are many errors you can encounter while sending or receiving emails. One such error is the ‘550 Permanent Failure Blocked’ email error. You’d most likely get this when sending an email to someone. In this article, learn how you can fix this issue.

What is the ‘550 Permanent Failure Blocked’ Email?

To understand the issue, let’s delve into the bounce email message you receive, which reads the following:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
host [168.xx.xx.105]
SMTP error from remote mail server after end of data:
550 permanent failure for one or more recipients (

As you can see in the bounce message, the recipient server has blocked your email address. There can be two different reasons for this.

• The sending server is blacklisted

The main reason behind this error might be that your server IP address is blacklisted. Email servers work with third-party spam monitoring companies like Barracuda and Spamhaus, who maintain a database of IP address that send high volume of spam emails. If an IP address is listed in this blacklist, the server will reject the incoming email.

To prevent this issue, you must check and confirm that the sender IP address is not blacklisted by these companies. If it is blacklisted, then take measures to delist it.

• Bad SPF record for domain

SPF or Sender Policy Framework records are important to check the authenticity of the email sender. It permits the server to send emails on behalf of a domain.

If emails come from a server that is not listed in the SPF record, then the recipient server will treat it as spam, thus rejecting the emails.

So you need to check if the IP address is listed in the SPF record. If not, you must add the following line:

Code: 600 IN TXT “v=spf1 a mx ~all”
Then send a test email and check if its delivered successfully. If that is the case, the problem has been solved.

So that’s how you fix the ‘550 Permanent Failure Blocked’ error. For further assistance, get in touch with the email hosting support team.
First release
Last update
0.00 star(s) 0 ratings

More resources from kumkumsharma