Email - Server (SMTP, POP, IMAP)

An email server is basically a computer with a SMTP service that will send, receive and store email message in their respective box on the server.

On top of it, you may find POP, IMAP and other services that will help to manage the mailbox box (read, delete, …) from the client

The email server IP are set in the DNS via the MX record. This is how a server knows to which server a message should be send.

Below you will find some SMTP server implementation

• Sendmail - SMTP server: the first linux server
• Email - Postfix - SMTP server: the new sendmail

Java:

• SubEthaSMTP is a Java library for implementing SMTP server functionality
• Apache James
• Java Email Server (a Java SMTP and POP3 e-mail server)

• https://github.com/masukomi/aspirin - Embeddable send-only SMTP server.

For development, see How to test if an email was successfully send ?

POP3 and IMAP