How do I find out my mail server blacklisted?

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

🥺 Was this helpful? Please add a comment to show your appreciation or feedback.

nixCrat Tux Pixel Penguin
Hi! 🤠
I'm Vivek Gite, and I write about Linux, macOS, Unix, IT, programming, infosec, and open source. Subscribe to my RSS feed or email newsletter for updates.

9 comments… add one
  • John Chow Feb 10, 2009 @ 20:56

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

  • Yonis Khan Feb 10, 2009 @ 21:18

    amazing stuff thanx :)

  • S Smith Feb 26, 2009 @ 3:40

    Thank you for your help!

  • Slots Mar 19, 2009 @ 16:43

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

  • Matthew S Oct 26, 2009 @ 14:57

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

  • Limousine Software Nov 12, 2009 @ 23:11

    I was looking for this info. thanks.

  • News Script Dec 4, 2009 @ 23:02

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

  • اخبار مصر Dec 21, 2009 @ 16:12

    I wasn’t aware of the many ripples and depth to this story until I surfed here through Google! Great job.

  • Carmelo Slaby Jul 25, 2011 @ 22:59

    I bookmarked this weblog a while ago as a result of the useful content material

Leave a Reply

Your email address will not be published. Required fields are marked *

Use HTML <pre>...</pre> for code samples. Your comment will appear only after approval by the site admin.