A client of mine currently has an @clear.net.nz email account. So I bought them a domain name and created an email account on some shared hosting I have a couple of websites on. Nothing taxing at all.

I created an IMAP account in Outlook2013 on Friday afternoon and by this morning it had used over 10GB in bandwidth ! I allocated more resources to try and find out what was going on and for the first hour nothing happened. Since 10am however it's almost permanently sat at 3MB/min.

They have only sent and received a handful of emails and they are plain text. There is nothing stuck in the outbox, nothing with any attachments, Outlook does it's send and receive in a time frame I would expect and email comes and goes as  you would expect.

I've searched the web all day to try and work it out but all I find are people having the same problem, mostly from a few years ago, and none with any explanation or solution. One suggestion is to delete the account and recreate it, but they say the problem returned.

Anyone seen anything like this before or have any suggestions on what to look for ?