A spam filter solution is a program that is used to detect voluntary and redundant email and prevent those messages from getting to a user inbox. Like other types of filtering programs
This method is not especially effective, too often omitting perfectly legitimate messages these are calledfalse positive and letting actual spam through. More sophisticated programs, such as
E-Mail filter can operate on inbound and outbound mail traffic. Inbound email filtering solution involves scanning messages from Internet address to users protected by the filtering system or forlawful interception.
Outbound email filtering involves the reverse scanning email message from local users before any potentially harmful messages can be delivered to others on the InternetOne method of outbound email filter solution that is commonly used byInternet service providersisclear SMTP proxy in which e-mail traffic
A less common use is toinspect outgoing emailsat some companies to ensure that employees comply with relevant laws. Users might also employ a mail filter to arrange messages and to sort them into
Sender Policy Framework(SPF)
TheDKIMRecord tool willtesta domain name and selector for a valid publishedDKIMkey record. Domain Keys Identified Mail (DKIM) defines a