How do I find out my mail server blacklisted?

by on October 27, 2006 · 9 comments· LAST UPDATED October 27, 2006


Q. How do I find out if my e-mail server IP address is blacklisted?

A. First make sure you are not source of spam:

a) You have correct reverse IP address mapping

b) Your mail server is not open to spammers

mxtoolbox offers test that will check a mail server IP address against 147 DNS-based blacklists. (Commonly called Realtime blacklists, blocklists, DNSBLs or RBLs). If your mail server has been blacklisted, some email you send may not be delivered. Blacklisting is a common way of reducing spam.

Step # 1: Find out your mail server ip address

For example if your domain name is
$ host -t mx nixcraft.comOutput: mail is handled by 10

Get IP address of this host:
$ host -t a has address

Step # 2: Now visit mxtoolbox site and enter a mail server IP address

=> Visit mxtoolbox web site.
=> Enter IP address

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{ 9 comments… read them below or add one }

1 John Chow February 10, 2009 at 8:56 pm

As a Newbie, I am always searching online for articles that can help me. Thank you


2 Yonis Khan February 10, 2009 at 9:18 pm

amazing stuff thanx :)


3 S Smith February 26, 2009 at 3:40 am

Thank you for your help!


4 Slots March 19, 2009 at 4:43 pm

Finally, the answers that I was looking for! Cheers mate.


5 Matthew S October 26, 2009 at 2:57 pm

Very good suggestions with some good content.well, keep up it..


6 Limousine Software November 12, 2009 at 11:11 pm

I was looking for this info. thanks.


7 News Script December 4, 2009 at 11:02 pm

Thanks for the great post and for sharing some really good tips.


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9 Carmelo Slaby July 25, 2011 at 10:59 pm

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