"Do not save" Checkbox on mails creation

[francisg]

When preparing a mail, either new or reply, would be great to have in the menu a checkbox "do not save" so that, when clicked, the mail is not kept in "sent messages".

This function exists on Outlook and is quite useful : there are multiple messages - e.g. the "thank you." , jokes, or similar - that you don't need to copy in your "sent messages" folder.

[Jon]

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