DNS Blacklist Checker:

Do all of your correspondents receive your e-mails? Many e-mail servers use DNS BlackLists (DNSBL) to filter out spam messages. Your mail server can be listed in DNS blacklists by a mistake. Unfortunately, you do not get a notification from DNS blacklist server owner, but your e-mail is filtered out by providers using black list.
UptimeInspector acts as a DNS Blacklist checker providing you with an instant alert when your mail server is listed in major DNS black lists!

Pricing

Pricing per month depends on a monitoring interval you choose. For detailed pricing table click here. For pricing calculator click here