Re: Outlook 2003 blocks outgoing e-mail messages that are medium to la

From: neo [mvp outlook] (neo_at_online.mvps.org)
Date: 11/14/04 

Date: Sun, 14 Nov 2004 04:59:04 -0800

Most likely it is a Linksys router problem. Try turning on one of the two
firewalls and connect directly to your ISP's Cable/DSL modem and try sending
the message. If my hunch is right, then you need to adjust the MTU of your
machine down since the Linksys is acting like a black hole router.

Here is something that should help you learn where in the registry to set
the MTU. As for the value, start with 1492. If that value doesn't work,
try 1460. You shouldn't have to go below that if you have a broadband
(cable/dsl) connection.

"James Fonger, M.D." <JamesFongerMD@discussions.microsoft.com> wrote in
message news:99D8C4A1-CF40-4E03-A047-B436BE3B8F6B@microsoft.com...
> Outlook 2003 e-mail works fine without attachments or with small Word
> documents attached. However with standard size Word attachments or larger,
> including PDF's etc. the Send hangs with the error message #OX800CCCOF
> saying
> it can't find the outgoing e-mail server. The mail server and my ISP are
> working fine. I have a Linksys residential router that works. The problem
> occurs despite having Norton e-mail filtering turned off, parental
> filtering
> not filtering e-mail, and my Norton Personal Firewall and Windows internal
> firewall turned off. Is this a Windows problem, an Outlook problem, or a
> Norton problem and how should I proceed with a stepwise troubleshooting to
> solve this? Some have said I should uninstall and re-install Outlook but I
> am
> not sure this is the answer. Please advise.
> --
> James Fonger
> interested user with a tough problem