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DNS blacklist (DNSBL) monitor software is used to monitor your email server public IP address in DNS blacklist zones like zen.spamhaus.org and many others.
Why you should use DNS blacklist monitor software
Blacklist monitor software lets e-mail system administrators know before users told them that there is a problem in outbound e-mail messages because DNS blacklist monitor software continuously checks if your public IP address is listed in any DNS blacklist and if public IP address of email server has been accidentally registered in any DNS blacklist zone, DNS blacklist monitor software will send a notification to the administrator to take action about this issue and minimize down time for outbound email messages.
Of course some outbound messages may be rejected by recipients which depends on what DNS blacklists used by recipients Anti-Spam and time taken to resolve the issue.
The below flow chart show how your outbound email messages will be checked for spam on the recipient email s