I think your second para was the problem/solution: my account with my ISPs is
used only to access the Internet, and I do not use their servers for Email.
My POP3 and SMTP servers are on my domain hosted elsewhere. I had therefore
not even created the free email account that they provide. It appears that
for traffic from non-registered EMAIL users, there is some sort of access
control on how often port 25 is sought to be accessed via their connection. I
created my free email account, and mail now goes through smoothly.
Now I have to watch that account.
I am not sure I get the logic and reasoning behind the setup at my ISP.
Wonder if someone could take me around.

Mohan

Vanguard wrote:
I have a problem which I cannot explain : in my office, I have an XP
SP2
[quoted text clipped - 17 lines]
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).

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