STMP, Simple Mail Transfer Protocol, is an Internet standard for electronic mail transmission across IP networks.
SMTP was first defined by RFC 821 (1982, eventually declared STD10), and last updated by RFC5321(2008) which includes the extended SMTP (ESMTP) additions, and is the protocol in widespread use today
How to use it:
1.Client software, under Outgoing mail, set the SMTP server to smtp.gmail.com.
2.Set the your username and make sure “Use username and password” is checked.
3.Also check off “TLS” under “Use secure connection.”
1.To restrict access to an outgoing mail server is to verify that the computer is on the ISP’s local network.
2.To restrict access is to insist on a local domain return address.
RFC,(Request For Comments), which memorandum on Internet systems and standards.