An email filter is a software app that obstructs unasked-for email messages from reaching a given mailbox. An enormous percentage of the email correspondence around the world involves spam messages: offers for pills or money, fake banking notifications, etc. Because of this, it is extremely important to enable filters to avoid not only spam email messages, but also any possibility of being swindled in some way. Filters detect various things, so as to guarantee better security – particular words and phrases or the frequency with which they occur in the text, the sender’s address, or the IP address of the sender’s outbound SMTP server. Web hosting providers frequently make use of the services of 3rd-party spam-tracing organizations that provide up-to-the-minute databases in order to render spam filtering better and easier without affecting legitimate emails, even if they contain suspicious words.