SMTP (Simple Mail Transfer Protocol) mainly responsible for transferring emails from one device to another, and is the actual standard for email transfer in the Internet.
Common SMTP and Special SMTP
1. Common SMTP: send emails from senders’ email system servers according to the directions of th users. Works like a postman who delivers letters.
2. Special SMTP: to cope with market demand, some email service provider, based on SMTP technology, launched Special SMTP services, which excel the functions of postmen, like:-
- send-to-boss: send a blind carbon copy to the boss or a specified address when employees send emails, as a means of monitoring
- volume control: put a limit on daily outgoing email, to ensure the server running smoothly
- email encryption: encrypt outgoing emails so that they can’t be opened even when being intruded