And it's kinda irrelevant if mail programs are starting to suggest or default to port 587, since it's ultimately up to the receiving server if they accept email on port 587.
I think a combination of SPF and SRV records are probably the ultimate answer to this.
- Colin
p.s. BTW, what email programs are defaulting to port 587 for outbound mail?
On Mar 3, 2004, at 4:58 PM, Robert L Mathews wrote:
At 3/3/04 12:42 PM, Bruce Dorland wrote:
Reseller's are using a combination of both sending mail through our email
servers and that of the ISP. In such case where the ISP has blocked
external access for Port 25, we have a non-standard port available as well
(Port 8025).
FYI, RFC 2476 sets aside port 587 specifically for this purpose. Port 587
is by design intended to not be blocked by ISPs, even if they block port
25 and other ports.
Some newer mail programs are starting to suggest (or even default to)
port 587, and this is likely to gain momentum as anti-spam measures such
as SPF get more popular.
Anyone using any non-standard ports for this should migrate to using port
587.
-- Robert L Mathews, Tiger Technologies http://www.tigertech.net/
"Ignorance more frequently begets confidence than does knowledge." -- Darwin
