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SMTP task is reliable and efficient transport of messages. This protocol is independent of network protocol, usually used is the standard Internet protocol, TCP. Communication takes place over port 25 Responsible for exchanging messages called. mail transfer agents (MTAs). The most famous is the Sendmail MTA. You usually do not have them directly involved. Delivery of mail to and from the MTA deal with mail clients such as Outlook or KMail. MTAs communicate with each other using ordinary ASCII characters. The client sends commands to the server, which corresponds to using a numeric code and an optional string. Simple Mail Transfer Protocol, however, has one major flaw - after sending an e-mail does not receive any messages to his fate. The specification provides the notification to the sender when the message can not be delivered. Is not clearly defined as such a message should look like. Typically, this is an e-mail with an error message and the m