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Typical SMTP connection consists of the following steps: * SMTP client initiates a connection to the SMTP server. Customers can use a random port number above 1024 and connects to the server port number 25 The server indicates acceptance of the communication connections 220 - Ready. * The client requests to establish a session by sending the HELO command (called Hello) or EHLO (called Extended Hello). It should contain the full name (FQDN) of the client. The server responds with a message 250 - ca * The client informs the server who sends the message, using the command MAIL FROM:-address-where-to-address-is the address of a user sending electronic mail. Usually corresponds to the address set out in the back and the client email program. The server should respond with a message re-250 - approximately * The customer then determines all the recipients to whom the message is addressed. Uses for that purpose with the command RCPT TO:-address-. If the server supports multiple recipients, each of which shall be sent to another command RCPT TO:. Server responds to each of the following information about the recipient, a message 250 - ca * Customer informs about its willingness to send the appropriate message communication DATE. The server responds with a message-250-ok. Specifies the string, which expects to receive the sign of the end of the message. Generally it is a . . Then comes a message to the server of that content. This message is sent using either a 7-bit ASCII. If accompanied by attachments, they must be prepared for him. Used for this purpose mechanism BinHex, or MIME uencode. * After the broadcasting of messages, the client sends a QUIT command terminating the SMTP session. The server responds with a message-221-closing, which means that it was the end of the session. If the client sends another message, the process starts again from the command MAIL FROM