[HLUG] when ever sending large emails drops my net connectiion - why

[Julian Robbins]

Hi

Hope the mtg went ok, list seems quiet these days !!

I've had a ongoing problem , i want to fix - any suggestions, fixes 
gratefully recd!

If I sent an email over roughly, 500k, my IPCop ADSL net connection drops.

I've no reason to suspect IPCop as this has been going on for many 
months, and i think it would have been fixed if it were a specific issue 
affecting IPCop.

If i send the same mail via webmail its fine.

I sent some tests via, my email smtp provider, fastmail.fm with and 
without SSL. I also tried it with my ADSL provider Pro-net, same 
problem, drops after getting only 21% through.

I use IMAP with my email account, which is flawless apart from this.

I'm using, FWIW Ubuntu Dapper, and Thunderbird 1.5.02, but I'm sure I 
had same problems, running Breezy and older version of Thunderbird.

IPCop has been there all the way along.

My only other inkling is could it be a MTU issue? we suspect Pro-net (or 
their upstream provider) are doing strange things with MTU which might 
cause issues, as we;ve had other strange ones occasionally.

I haven't tried connecting with my windows laptop yet, thsi might at 
least prove or disprove a couple of things.

Any ideas ??

Julian Robbins