Constantly Having to rebuild mailbox
I am at my wits end with my mailbox. I have a few accounts in my mac mail and one of them will frequently (several times a day), empty itself. I fix it by rebuilding the mailbox, which redownloads the thousands of messages on my server. This also happen on my iphone. Does anyone have any ideas on how to fix this? I've tried deleting the account and re-adding it, but that didn't work. I'm osx 10.9.1 and running mail 7.1. Thoughts?
Thanks!
Mac OS 9.1.x