info wrote:
Many of my remote users send email from their residential DSL
connections.
As do I, using SMTP AUTH on port 587 to utilize my work SMTP server.
Charter and SBC for instance require that their customers
use their SMTP servers.
NO, they do not.
They require that if you are connecting to port 25 SMTP service you use
their SMTP servers. If you use webmail, or SMTP AUTH over port 587, etc
then you are not required to use their SMTP servers.
In reality, they do not care if you use their SMTP servers or not, they
*do* care if client machines connect to port 25 of someone else's
server, because that is usually indicative of a virus/trojan infected
machine acting as a mail relay. Hence why they block port 25. Which
makes it *appear* like they are forcing you to use their mail server but
is *not* the real motivation.
If I have an SPF record for domain.com and the MX record for domain.com
points at my corporate email server and my remote user sends an email
from the SBC SMTP server as employee(_at_)domain(_dot_)com
<mailto:employee(_at_)domain(_dot_)com>, will the email get blocked?
It should, unless your SPF record includes the SBC SMTP servers (which
in of itself can be a bad idea).
Use SMTP AUTH, webmail, etc for roaming users, its the right tool for
the job.
Terry
Thanks,
Dan
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Terry Fielder
terry(_at_)greatgulfhomes(_dot_)com
Associate Director Software Development and Deployment
Great Gulf Homes / Ashton Woods Homes
Fax: (416) 441-9085