There are a many spam cops on the internet who maintain anti-spam database. Mail servers, Isps and bandwidth providers get blacklists from these databases and use them in their spam filters. Domains and Ip addresses that are known to send spam emails are blacklisted immediately and added to the database. When a mail server finds that a mail comes from one of these blacklist sites, then the email will not be delivered to the recipient.
Many times, the Ip address of your hosting victualer may be in the blacklist and as a result, your emails may not be delivered. You may be wondering why is my Ip blacklisted even though I pay the required amount. Your Ip getting blacklisted is not your fault because spammers use Ip addresses of other legitimate persons to conceal their own identity. Without even your knowledge, you may become a victim of such a spammer and your Ip may get blacklisted.
Just because your Ip is blacklisted by a mail server, it doesn't mean that you can never reach that subscriber. Blacklisting simply means that your email won't be delivered directly. You can caress the mail server and invite to whitelist your Ip address. If the victualer is able to trust that you are not a spammer, then your Ip address will be removed from the anti-spam database and the changes will reflect globally in one or two days.
If you want an riposte to the ask is my Ip blacklisted, you have to do blacklist test. Some servers may allow your Ip address while some others may blacklist it. You can know about those servers only when you compare your Ip address against known blacklists. Since it is not possible for you to go and check every blacklist available, you should use a mail tracking tool to do this task.
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