Thanks Fyrebird10, Green1 and CrashedAgain for your prompt replies...

Fyrebird10 ->

I do get an error message only when using Gmail on the web. Error is: Document Contains No Data. The other way I tried (thru SMTP) it just gets stuck at 87% transmission. According to gmail help site, Document Contains No Data error should only occur if I am transfering exe file or file larger than 10Mb, but the files I am trying to transfer are .jpeg and .pdf and none were larger than 40kb.

Green1 ->

Yes, POP settings are correctly set (ie I can receive mail without problem). SMTP works fine also using regular email or when attaching .doc files or .txt files, it only blocks with jpeg and pdf.
I also know it is not my ISP blocking the files since I can send attachments fine when doing it under Windows...

CrashedAgain ->

Well it is encouraging to know that I should not have trouble sending attachments. Still a mystery to me...

As far as connections go, I am using dialup from home. But the other PC i tried this on (using Knoppix Live and also trying Ubuntu Live) still had the same symptoms and it is using token ring...

Thanks for all your help...

Francis