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SMTP


Simple Mail Transport Protocol. This is how E-MAIL is transferred on the Internet.

Wikipedia:SMTP states:
It is a client-server protocol, where the client transmits an email message to the server. Either an end-user's email client, a.k.a. MUA (Mail User Agent), or a relaying server's MTA (Mail Transfer Agents) can act as an SMTP client.

The following diagram is inspired by the Linux Electronic Mail Administrator HOWTO:

+---------+          +-------+
| sending |  calls   |sending| 
|   MUA   |--------->|  MTA  |::::>::::
|         |          |       |       ::   on the
+---------+          +-------+       ::   sending
                                     ::   machine
............................................................
                      SMTP           ::
 ::::::::::::::::::::::<:::::::::::::::
 ::
 ::   +---------+         +---------+
 ::   | relaying|  SMTP   |receiving|
 ::::>|   MTA   |::::::::>|   MTA   |
      |         |         |         |
      +---------+         +---------+                                     


SMTP connections are used by email client applications to transfer the message to the internet for delivery.
SpamCop Email service does not support remote SMTP connections*. To send email using SpamCop's SMTP services, you must log into the WebMail application and send the message directly from that connection.
* Remote SMTP service is currently be tested as a beta service - see SMTP-AUTH

Spammers would love to sign up for SpamCop and send spam just to discredit the service. You need to use your ISP's SMTP server or check out Jeff G.'s Hotspot SMTP-Auth Provider Status Report for other SMTP services.

SMTP-AUTH extends the protocol by including an authentication process.

External Links
Wikipedia:SMTP
RFC2821 SMTP
 


CategorySpamCopGlossaryWikiS
CategorySpamCopMailService

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