Email How to know where to go?

If you enter an email address on a message and click the send button to e-mail know where to go?

The e-mail client (e-mail software) wraps in addition to the correspondence of certain information in the message and sends e-mail SMTP Server (handles SMTP server for outgoing mail. SMTP is Simple Mail Transfer Protocol) Which SMTP server is configured to use the e-mail software. Most people use the SMTP server provided by their Internet Service Provider (ISP). Or, if your web-based e-mail such as Hotmail or Yahoo mail, you have no control over the SMTP server – will be built.

The SMTP server accepts the e-mail, it looks like the IP address of the target server breaks the message up the packages and send the packets to the target of a series of "hops" (usually a series of very large performance router). The road that takes the e-mail is determined by the various routers across the Internet. Internet routing used by the router compared supercomputer. They look for different possible paths to the goal, and decide on the best route to take. The individual packages are all on the same route, or some one to go through my trip, the router may decide to too much traffic on this road, and send the rest to pack a different path, or a variety of other ways.

After all the packages arrived, the target server (usually the "POP" server) hooks the packets back together and place the e-mail in a separate file, and wait for the beneficiaries request the e-mail.

The e-mail servers actual conversation. As you can see below it are still very polite. This is a real conversation identification obfuscated. The sending server connects to the destination server. He says hello. The target server responds, Elho. They even have a first name basis. The sending server says, "I have a message from one man, and this is big."

The target server looks up the e-mail address, and it looks like that if you want to, and the ability to e-mail recipients to receive. Then, says the source host. "Ok, send it to"

The sending server and says, Okay, I'll send the message. You'll know when this happens, when you see the two carriage return line feed (CRLF) back to back. The receiving server then confirm the message and end the conversation.

Connection [] 25 … connected

SMTP (host) 220 ESMTP server ready K, December 23, 2008 21:58:40 +0000

SMTP (sending) EHLO

SMTP (inclusive) 250- 250 ETRN 250-AUTH PLAIN LOGIN 250-AUTH = PLAIN LOGIN 250 250 pipelining DSN 250-8BITMIME SIZE 250 15.72864 million

SMTP (sending) MAIL FROM: @ 411.4.600062-12189942 (sending) RCPT TO: @ kxxxy

SMTP (sending) DATA

SMTP (receiver) via 411.4.600062-12189942 @ 250 and Extensions (S

SMTP (receiver) 250 Recipient kxxxy @ OK

Send SMTP (host) 354 S data ending CRLF.CRLF

SMTP (sending) a written message and closing. . . . . . .

SMTP (host) 250 messages received: 20081223215845. @

SMTP (sending) QUIT

Source by Allen Howard

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