Whether you are an individual user sending email to friends & colleagues, or use a commercial email-sending service like Constant Contact, it is important to regularly check your sending ip address hasn't been black listed.

Today we released a simple tool that lets you easily test if your mail server is black listed with any popular black-list DNS service:

Email mail server Blacklist Checker



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Don't know your sending mail server ip address? Send an email to yourself, then view the message headers.

Wow, thanks for the freeware tool. It's great for quick checkups.
You made a great blog here.