On Sep 6, 2004, at 3:29 PM, Matthias Leisi wrote:
I've encountered a number of ISPs where users are unable to do
outbound connections with dst port 25, but are limited to the ISPs
Smarthost. Although I haven't seen it yet, but I suspect that Port 587
as per RFC 2476 (Message Submission) may be blocked as well if it's
use is adopted more widely.
The recommended best practices for port 587 are that:
* Access providers SHALL NOT block the port.
* Submission agents MUST employ some means of authentication for
submitters.
Tripp