What mean anti spam

Other Names: spam filter, spam email software, email spam filters, filtering email spam, spam protection software, software for blocking spam, anti spam, spam filter software, spam filters, filter spam software, spam blockers, spam software, anti-spam.
Definition: A gray list (also spelled gray list) is a list of e-mail addresses or domain names of a spam filter can be used to identify suspected spam. When a message arrives from an address or domain from the list, it will be quarantined, and then delivered to the subscriber if the sender attempts to resend the message within a certain time.