on 10/3/05 8:02 AM, Larry Stone at [EMAIL PROTECTED] wrote: > Now I'm not totally sure of the chronology of the rest but over time, > extensions to SMTP were developed to allow, among other things, > authenticated sending via port 25. But unfortunately, SMTP is still > largely insecure. So also developed were the standards for the submission > port, 587. Submission meaning the initial injection of a mail message from > a client into the SMTP world.
>From what I remember, SMTP Submit port was made for a few reasons, the most important being to be able to isolate a server to server connection vs. a client to server connection. Its nice to be able to glance at your server logs and know, oh, this is a client connecting, or oh, this is a server connecting. With this isolation, large ISP's like comcast and such, can now be more aggressive about spam filtering, since there are two ways to look at incoming email, ie: port 25, could be spam, port 587, more than likely not spam. Further, they require authentication, which means a virus written to exploit a non credential requiring port 25 will break. Sure, the viru's will work around this, but it is much harder, as they now have to extract your username and password, where in the past, they could just blindly send over port 25. -- ------------------------------------------------------------- Scott Haneda Tel: 415.898.2602 <http://www.newgeo.com> Novato, CA U.S.A. -- To unsubscribe: <mailto:[EMAIL PROTECTED]> archives: <http://www.mail-archive.com/entourage-talk%40lists.letterrip.com/> old-archive: <http://www.mail-archive.com/entourage-talk%40lists.boingo.com/>
