What Is a SMTP Host?

SMTP hosts are used to help deliver email across the Internet. At the same time, SMTP servers have to be configured properly to prevent usage by spammers.

Definition

SMTP stands for Simple Mail Transfer Protocol.

Function

SMTP hosts are designed to accept mail and either forward them to the Internet or deliver them locally.

Prevention

SMTP hosts are normally configured as a closed relay, meaning only users on the same network as the SMTP host can forward mail to the internet. This is to prevent spammers from using the SMTP host to deliver their spam emails.

Configuration

Mail programs on a user's computer system need to be told what their SMTP host is. Otherwise, the mail programs will not know how to send mail onto the internet.

Identification

SMTP servers available for public use can be found by asking any internet service provider or network administrator.

Resources

• Read this Article in Spanish
• IETF official document on SMTP