J.R. Oldroyd wrote: > On Sun, 22 Mar 2009 11:06:04 -0400, Paul Houlbrooke <[email protected]> > wrote: >> ASSP 1.5.1.0(1.0) >> >> Instead of using SSL on port 465 for SMTP connections, is there any >> reason I shouldn't have clients just use TLS on 25 which then gets >> converted to SSL? This seems like it would be simpler for them to setup >> because they wouldn't have to change any ports. >> >> > You Subject is confusing. TLS and SSL are two names for the > same thing. > > The standards define port 25 to be plaintext. The server can > offer "STARTTLS" and if the client uses that verb, the connection > is converted to TLS/SSL. This port is intended for MTA-to-MTA and > for older local clients. > > Port 465 used to be defined as TLS/SSL from the start, but this is > now deprecated. You should avoid using 465 if you don't need it; it > is there if you have older clients that only know about this port and > can't be reconfigured. > > Port 587 is defined also as plaintext with a STARTTLS possibility. > Port 587 is often configured to require client AUTH. You probably > want this port for your local clients, but 25 is ok too. > > Ports 25 and 587 are more-or-less equivalent. At some sites they > are exactly equivalent. If the server offers them, both can support > AUTH and both can support STARTTLS. The difference is only in that > port 587 is intended to require use of AUTH, wheras on 25 AUTH is > optional. > > -jr >
Thanks. That clarifies things for me. ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Assp-test mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/assp-test
