Send and Receive gets half way

I have a PC linked to a DSL modem with outlook as the mail client. I tried to send an e-mail of about 3MB when I clicked send and receive the progress bar got half way and stopped. I cancelled the operation. I tried sending again later the same happened. I then deleted all the e-mail in my outbox and restarted the machine as well as the modem. I still have internet access. I tried sending and receiving again and it still gets stuck half way on the progress bar. What could it be?
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Try turning off any Anti-virus utility during the send process, then turn it back on immediately after.

Warning: There are of course risks with turning off AV.

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