Incomplete emails being sent

[Pam11]

In the past few days I have been trying to type responses to emails but before I can complete the email it appears to automatically send to email (without me pressing the send button).  Despite this, the receipient is not receiving the half written response and nothing is  appearing in my sent box. Hope this makes sense! Can anyone help please? I'm not sure what is happening. Thank you in advance. 

[caesarome]

@Pam11 

Are sure the half complete email isn't being stored in your drafts folder as this is what should happen on email accounts.