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SMTP
Uses TCP port 25. Use direct transfer divided mainly into three phases:
- Handshacking (open connection)
-Transfer
-Closing connection
The communication between devices takes place by means of an exchange of messages.
Once the mail server has stored the mail there aredifferent protocols to access data:
POP, allows downloading and authentication. E 'stands forPost Office Protocol
-IMAP, allows for complex functions. E 'stands for MailAccess Protocol
HTTP-

POP3
The communication begins with the authentication phase. Username and password is sent followed by a response of OK or-ERR (transaction). At this point there are several basic functions:
-LIST, list all posts with their respective number
-RETR, makes a request for a specific message by number
DELE delete a message given its number
QUIT, closes the session

IMAP
all messages are contained in the server. It has the ability to divide messages into folders and to maintain state between sessions.

MIME
MIME types:
Text-(PLAIN, HTML)
-Image (GIF, JPEG)
-Audio (BASIC)
-Video (MPEG)
....

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