Mail 7.2 issues with drafts When I type a reply email multiple copies of this email get saved in drafts.

I've read over the posts tagged mail.app and I thought I hit the jackpot with this answer by @Kyle, but when I navigate to Accounts>Mailbox Behaviours there is no option for disabling saving drafts on the server, 
or am I missing something?

I am running Mail 7.2 on an MBP with OS X Mavericks 10.9.2

When I type a reply email multiple copies of this email get saved in drafts, then these drafts all appear when I have View>Organize by Conversation ticked. Our company uses gmail as our mail service. This does not happen when I use my own gmail account. 

This is really annoying as when I am writing a long email, there can be an additional 20 "emails" in the email trail.

I get the same behaviour whether I am running IMAP or POP.

Is there a way to stop this?
The reason for this issue was the fact that I had set up the account as a POP account in apple mail.

When IMAP is selected the following screen appears:

and as can be seen the first item is the one I was looking for.

Drafts : Store draft messages on the server. 

When the option above is not ticked the issue stops.