On Thursday 28 September 2006 03:10, Arthur Sherman wrote:
> > Believe there are three (3) different "smtp" types, smtp on
> > port 25, smtps on
> > port 465, and smtp-auth on port 587. If you are "changing"
> > the server to use
> > smtp-auth, your clients _must_ change and use the appropriate
> > connection type
> > (read that port number and protocol) for it to be effective.
> >
> > Generally on a server using only smtp-auth is not an option
> > since most of the
> > world does not have an account and password on your box to be
> > able to send
> > you mail - so one usually runs smtp-auth for clients, and
> > smtp for outside
> > world connections.
> >
> > --
> > Larry Smith
> > SysAd ECSIS.NET
> > sysad (at mark) ecsis.net
>
> Hi Larry,
>
> If I enable smtp-auth, but not submission port, what will happen?
> Will it work over regular tcp/25, or it just won't?
>
Arthur,
Do not believe it will since the smtp-auth (from the submit.cf file) is
configured to "ask" for a username and password pretty much like pop3 (port
110) does when the user/client connects. Even if you configured that on
port 25, it would then ask every connection for username and password.
Outlook and most other mail clients now support smtp-auth (server requires
authentication) on port 587, so it is really the "best" way to go for clients
since you can then turn off poprelayd as it is not needed when the clients
can authenticate to send mail from just about anywhere and also the port 587
is not blocked by any ISP that I am aware of so you don't have problems with
cable, dsl, etc people blocking port 25.
--
Larry Smith
SysAd ECSIS.NET
sysad (at mark) ecsis.net