Windows Live Mail not receiving emails.

Since unsuccessfully sending pictures to myself, from one PC to another, Live Mail apprears to be 'blocked' and will now not receive emails. The  error message is 'Unable to send or receive messages for the Btinternet (paulstephen2) account. Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity'.

The emails with attachments earlier sent to myself have not been recieved and seem to be clogging up the email system. Can anyone help please?