The emergency of protocol smtp

One of the limitations of original protocol smtp is that it does not managethe authentication of the senders. Beyond to the Spam risk, the possibility exists to send email making to appear like sender the address correspondent to an other account. Without to approach the account of thirds party, logon to the mail-serveur is possible to establish one and to write containing a coded message smtp the relative commandos you to sender and adressee, to give to the relati to you parameters and the body of the email.

In order to obviate to these problems it has been developed a called extension SMTP-AUTH.

Although this, the Spam remains a serious problem still today. However, a radical review of protocol smtp is not thought practicable, for via of the great number of implementazioni of the protocol puts into effect them as an example (, has been proposed Internet Mail 2000 like alternative protocol).

For this reason auxiliary protocols have been various proposals in order to assist transactions smtp.The Anti-Spam Research Group ofthe IRTF is working on several proposals of authentication email centered on the flexibility, lightness and scalabilità.