![]() ![]() These may include spam triggers for specific senders, words in the subject line, etc. Rule-based or heuristic filters that check an incoming message according to the criteria defined by the user.Blacklist filters that check whether an incoming message has been sent from a sender not specified in the blacklist.Header filters that check the header of an incoming message for infectious or falsified information.Content filters that check the content of an incoming message for spam trigger words, malicious attachments, refined HTML code, etc.Spam filters can differ depending on the criteria they evaluate and the way they are implemented. The filtering practices are usually undisclosed for security purposes, but we still have a general understanding of what they do and don’t like. There is a long list of spam criteria, and it gets modified and adapted every day. Otherwise, you’ll find it in the spam folder. If the score meets a certain threshold, the email will be inboxed. Spam filters work the same way and assign a spam score to the message. They leverage specific criteria to evaluate an incoming message and place it into the relevant folder. Today, many email service providers and email clients break down your messages by social, commercial, newsletters, and other categories. Filters not only block incoming messages but organize them as well. ![]() The success of your email campaign is heavily reliant on filter technology. And though they seem like bad guys, they actually protect us from phishing attacks, spammers, and malicious emails. These are protocols that decide whether to let in an incoming message or not. Most internet service providers (ISPs) have spam filters.
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