Mail DELETED when switching between accounts!

I was writing/composing an email in one account and had spent some time on this. Then I switched from my zoho account to my other mailaccount (pop account). When I switched back, the mail under zoho was gone! I repeated this to make sure it was not just bad luck. NO, this happens again! PLEASE change that! Now I have to write the whole mail again.

At least save a draft when changing, but it would be best to just keep the tab with the new mail in this account open.