What is an Outgoing Email Server?
Simple Mail Transfer Protocol (SMTP) is a set of rules or standardized protocols for sending and receiving email across networks like the Internet. A computer that runs SMTP is referred to as a mail server, and ideally has a near-constant uptime. The SMTP mail server can both send and receive mail, albeit at the client level we associate SMTP with an outgoing email server, and Post Office Protocol 3 (POP3) with incoming mail. Email clients require an address for the outgoing email server and the POP3 or incoming server in order to collect and send mail. Internet Service Providers (ISPs) provide these addresses to customers at the time a subscription or contract is enacted, and mail server addresses are also commonly listed on the ISPs’ website. In some cases both outgoing and incoming mail will be handled by a single server, such as mail.[yourisp].com; but often the outgoing email server address resembles smtp.[yourisp].com, and the incoming address, pop3.[yourisp].com. Authentication
An outgoing email server is responsible for delivering your message to the appropriate location. SMTP (Simple Mail Transfer Protocol) is the standard for transmitting messages across the Internet. Where as, the incoming email server has to worry about who you are, and where to keep your messages, the outgoing email server has but one job: delivery.
