I tried to send a large attachment the other day, and I have been unable to receive email since.  I can send email, and I can receive using a second account on the same server.  I use an exchange server, and I can access my email on the web, so I know it is not the server.  I believe I deleted the "sent" mail since there is nothing in the Outbox (which had to be brought up by going offline first, then sending a test email).  I have gone through numerous steps: checked settings with ISP, deleted outgoing mail, using Applescript to delete Outbox items, setting up a new identity.  Nothing is working.  I need some help to figure out how to receive my emails.  Thanks.