How does SPF work with ISPs who require users to send all SMTP mail
through the ISPs servers, even users whose accounts are with other email
providers? For example, we are a college in PA. One of the local
ISPs requires our off-campus students who are on their network using our
email or any email account to send email through the ISPs smtp servers.
If this would go to an smtp server which was doing SPF lookups, they
would lookup our SPF records in DNS and we do not have this external
SMTP server listed. We can't possibly list all ISPs which our students
might use to send email. Should we contact the ISP and request that
they no longer restrict smtp leaving their network? It becomes an even
bigger problem because other ISPs around the world do the same thing and
we have no idea if our students are using any of these ISPs to send
mail.
If someone could please clear up the confusion or explain to me what to
do in this situation, it would be greatly appreciated.
Thanks!
Andrew Gutkowski
CNA, MCP, Network+, A+
Systems Administrator
Pennsylvania College of Technology
One College Avenue
Williamsport, PA 17701
agutkows(_at_)pct(_dot_)edu
570-329-4918 phone
570-321-5554 fax