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Common Email Terms Glossary

Web-based Email is an email account. It is accessed through a Web browser (IE, Firefox, Maxthon, Opera, etc). The advantage of web-based email is that users can access the inbox from any computer with Internet-connection. A Web-based Email allows access to such functions as reading, organizing, and sending messages. Emails are stored at provider's servers, but not downloaded to the computer. Popular Web-based Email services are Yahoo, Hotmail, Gmail.

Mail Server is a computer (with the appropriate software) working as an MTA (mail transfer agent). Mail Servers are used to transport mail. Email server gets emails from the email clients and transmits it to the recipients' email client.

Email Client is an application to receive, read, store and send email messages. The most popular email clients are Outlook Express, the Bat!, Eudora.

Opt-in is email advertising means of sending email messages (newsletters, ads) to those people who requested them. People deliberately subscribe to it. It is a legitimate way to conduct marketing campaigns via email.
Opt-in is known also as permission-based marketing.

Opt-out means that people are signed up without their permission or knowledge to the email advertising lists. If people don’t want to get the emails, they can request to be removed from the lists.