On 2012-08-03 22:51:08 -0700, Phil Pennock wrote: > Mail submission from an MUA should be going to the submission port > (587/tcp) and probably authenticating with SMTP AUTH; if not > AUTHenticating, it should be on a trusted IP and implicitly > authenticated by being on an internal network.
That may be the best solution, but the end user doesn't necessarily have a machine providing such a service (or it may be unreliable because shared with other users and also used by spammers). In such a case, the user would want to use the MX of the destination address. -- Vincent Lefèvre <[email protected]> - Web: <http://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
