Firewall Wizards mailing list archives

RE: Blocking email through the web services


From: "Nieveler, Juergen" <Juergen.Nieveler () akzonobeldeco de>
Date: Wed, 22 Jan 2003 16:25:53 +0100

Is there a common port I can block that will prevent users from 
downloading email from webmail services such as aol, 
hotmail or msn, used 
by all - without blocking www service in general?

Try port 110 (pop3), 995 (pop3-ssl) and maybe 220 (imap3) and 993 
(imap3-ssl), too.

That won't help - he's talking about Web-based services, and those go
through port 80/443.

The only chance is to block file downloads on the proxy-server - and even
that won't work if the Webmail service offers SSL.

-- 
Mit freundlichen Gru?en / Yours sincerely
Juergen Nieveler
Akzo Nobel Deco GmbH
IT / Netzwerk & Systeme
eMail: Juergen.Nieveler () AkzoNobelDeco de

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