"bnmohan via WindowsKB.com" wrote in message news:75a59cfc37fec@uwe...
I have a problem which I cannot explain : in my office, I have an XP
SP2
machine running Norton SBS 10.1 which acts as the mail server. I have
two
broadband connections from two different ISPs. Through one, there is
absolutey no problem When I shift to the other, Internet access if
perfect,
accessing POP3 accounts, but accessaing my SMTP server : waits for
ever. Or
sort of. Suddenly, after say 15 minutes, the mails go. And then again,
server
timeout.
When I get back to the first ISP, absolutely no problem. I checked
with my
Web Site hoster, and they replied that theuy have not blocked SMTP
access to
the address space that the second ISP uses.
BTW, on the first ISP, I have a static IP, while on the second I get a
dynamic IP. The proxy server is Freeproxy, but the problem remains
even if
the proxy is bypassed by the email client on the mail server.

Unless you have a business account whose TOS says that you can run
servers on your own hosts, don't expect your ISP to permit them. For
personal accounts, your ISP may require that you use their mail servers
(and may even further restrict that you cannot connect to off-domain
mail hosts). Sounds like they may have not simply blocked all access to
off-domain mail hosts, including yours, but instead have instituted an
anti-spam quota as to how often you can get at them.

Don't know what is Freeproxy (other than the indication that is it some
kind of proxy). If you are trying to route your mails through a public
relay then maybe your ISP is using DNS blocklists of known spam sources,
and that includes open proxies. Use something like DynDNS to provide an
IP name for your dynamically IP addressed host (actually that'll only
get you to the WAN side of your router *if* you router supports DynDNS,
or you'll have to run their client that runs on your mail host to report
its IP address in that intranetwork to DynDNS).