trouble with 1 users email account

hi all

my OH hasnt been able to get his email fro 5 days !!!

His settings are exactly the same as mine which is working fine but now his sent, inbox and trash are completely EMPTY !!!!!!

First our ISP said it was our end, then that there were large emails that needed deleting before they'd download and now it's to do with our email client????

We've checked on the 'email doctor' and the largest email was a poxy 42kb!!! Now deleted but still NOTHING !!!! Very annoying as some very important documents and archived stuff obviously!!!!!

ANYONE ABLE TO HELP ???