An email filter is a software app that obstructs unasked-for messages from reaching a given mailbox. A substantial percentage of the email correspondence around the world is composed of spam messages: offers for pills or money, fake bank notifications, etc. For this reason, it’s quite important to activate email filters in order to avoid not only unsolicited bulk email messages, but also any chance of being scammed somehow. Email filters detect different things, so as to ensure higher levels of protection – certain words or the frequency with which they appear in the text, the sender’s address, or the IP of the sender’s outbound SMTP server. Web hosts often make use of the services of 3rd-party spam-detecting organizations that provide up-to-the-minute databases in order to render spam filtering better and easier without affecting legitimate emails, even if they comprise suspicious words or phrases.