A user found an obscure bug in Outlook:
When you use Send To > Mail recipient or insert an attachment into a message before adding the address, and select a name from autocomplete that is over the attachment, you can send the message just by pressing S.
Well, it takes a little more than just clicking on the autocomplete entry that is over the attachment. You need to *double click* on the autocomplete entry.
The autocomplete list was designed to be used with a single click and when you double click, it selects the address on the first click, adding it to the To field, then the second click selects the underlying attachment.
If you type S to add a recipient while the attachment is selected, youâll send the message. Because the cursor is not in the address field, it won't bring up the autocomplete list of contacts whose name begins with S. The correct behavior should be "nothing happens".
There is definitely a bug here. Selecting an attachment and pressing S shouldnât send the message, but you shouldn't be double clicking on the autocomplete address. It was designed for a single click.
If you donât double click on the address, you wonât have a problem, although if you tab out of the To field and stop on the attachment, S will send the message too.
The workaround is easy: if you use a mouse to select entries from the autocomplete list, use a single click or select the address using the arrow keys and press Enter.
The keyboard shortcuts for send is Alt+S or Ctrl+Enter. In some instances, such as with meeting requests, Ctrl+S may send.