![]() Depending on the reliability of the service, the level of its spam protection will differ. The most popular of these are Gmail, Outlook, Yahoo! Mail. If the system finds the IP in the Blacklist, it does not allow the incoming messages from this address. ![]() For example, ISPs collect DNS-based Blacklists, by which they automatically check senders. Their security measures apply to spammers as well. They develop rules to screen out suspicious activity on the network. In the fight against spammers, many entities are involved: How Do Spam Filters Work?įirst, let’s find out about spam filters. This article will help you deal with the main reasons that emails fail to pass through the spam, and teach you how to avoid emails going to spam. And let’s not forget that your subscribers can mark your messages as spam even after they receive them. Modern spam filters are constantly being improved, so every email marketer should keep pace with these changes. When launching an email marketing campaign, even the most successful companies face the threat of spam filtering.
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