SPAM filters may identify locations on the web that send large amounts of emails. If a source or server is sending SPAM, the location is "blacklisted" - added to a Email Database blacklist of unacceptable sources of email. Internet Service Providers use these blacklists as a tool to block SPAM, by preventing email from the listed addresses from getting through. If your address appears Email Database on a blacklist, the majority of your email messages will never get through to the recipients. Whitelist - a list of allowable email addresses, domains or IP addresses.
Some ISP's use whitelists to identify legitimate servers or Email Database companies that send bulk emails. Bulk emails are allowed from those identified, as it has been verified that they are sending information only to people who have requested it. Email software also Email Database contains both white and black lists of senders, as an aid for filtering SPAM. Many subscription services request people to add the sender to listing of allowed senders in their email programs, to assure a better chance of delivery.
Auto-responder - A software program that monitors Email Database an email address, sending out a preset automatic response upon receipt of an email message. This type of software often has a number of facilities such as sending a sequence of emails, selecting an Email Database appropriate response from a variety of email messages, or allowing for subscriptions to be added or removed from a database. Mail Server - A software program that transfers email from one computer to another computer. The program on your PC "talks" to a mail server that manages a large number of user accounts.