Reasons for being blacklisted

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Of course, the most common reason why an email domain or IP address gets blacklisted is for sending spam.

If you are actually sending spam, there is nothing you can do about it, but the scary thing is that there are cases where you may be judged to have been sending spam even if you are not the one sending it.



A commonly reported example is when marketing list of rv owners emails are repeatedly sent to invalid email addresses, such as addresses that are no longer in use or that contain incorrect characters.

In that case, depending on the destination server, it may determine that a list attack has occurred and add the email to a blacklist.

In addition, there have been cases where an invalid email address is entered into a homepage input form multiple times as a malicious prank, and if the automatic reply function is enabled, it may be determined that this is a list attack and the email address may be added to a blacklist.



In either case, repeated emailing to invalid email addresses is the cause of blacklisting.




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How to check if you're blacklisted
To check whether the email domain or IP address you are using is on the blacklist, first check the IP address of the domain that is causing sending errors and make sure it is not spam.

Regarding domains and IP addresses suspected of spam activity, representative organizations include Spamhaus , a non-profit organization, and SpamCop , a public blacklist database service.

You can visit these sites and enter your domain or IP address to find out if you've been blacklisted.