Very Strange E-mail Problem

Has anyone out there heard of a problem like this? I can’t send file attachments. If I attach a picture or a Word file, it never arrives at its destination. I can, however, attach a very short text file and it arrives. This started yesterday morning.

I thought it was only through my nuthouse account. But then I also couldn’t send attachments through another account.

So I went to another computer – a Mac now – and sent some files through Hotmail and .Mac accounts. THOSE files also did not arrive.

I find that I CAN send files through my Comcast account that comes with the cable modem service.

The files sent yesterday still have not arrived.

Any ideas?