What is Email Filter?
An email, or spam, filter is technology used to block otherwise deliverable email based on certain email-sender criteria, including content, subject lines, or the originator. Different factors are used to determine which incoming email should be filtered, or blocked, according to a weighted spam score. The email campaign will pass through the filter depending on the server. More aggressive email filters generate “false positives” that flag authorized senders’ using confirmed opt-in lists preventing email messages from being delivered to agreeable recipients.