On 17/11/2006, at 7:00 PM, Fritz Borgstedt wrote:
Questions and Answers for users of ASSP Anti-Spam SMTP Proxy
<[email protected]> schreibt:
I think I've figured out how to do this. My clients will send emails
using port 465, which will go to stunnel. All normal SMTP traffic
from outside will come in on port 25 and go straight to ASSP.
why 465 and not 587?
Not really sure. Found on Google:
% grep 465 /etc/services
smtps 465/tcp # SMTP over SSL (TLS)
analogous to https - ie you connect and immediately have an SSL dialog,
as opposed to ports 25 & 587 where you connect and talk SMTP and may use
STARTTLS to transition to a (SMTP over) TLS encrypted session.
My experience is that STARTTLS support on port 587 is pretty common
these
days. There's nothing wrong with 465 either, just an SSL/TLS
connection to
that port. I'm using 465 (just stunnel) because I couldn't figure out
how
to force a TLS session on 587 and I figure with a dedicated SSL/TLS port
you know for sure that the only connections are encrypted.
I think it is for legacy clients that don't support STARTTLS. I don't
really know. I think that they used port 465 in the stunnel manual
and I just used that.
James.
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