How to cancel outgoing Apple Mail messages hanging in send preparation mode.
If you have multiple SMTPs through which you send mail, you may at times find that the message you send, or reply to as a send, can take forever while you wait for Mail to figure out that the outgoing smtp server setting its trying to use is the wrong one. You have two options. You can patiently wait and eventually, (it can take minutes), Apple Mail will pop up a dialogue listing the other send mail smtps you ought try. OR you might want to cancel the preparation instantly.
To cancel a mail message preparing to send try having the Mail Activity window open. The hanging mail will show on a list with a RED STOP SIGN button next to it. Click that button, and the mail preparation process is instantly cancelled and placed in a temporary OUTGOING Mail box. In that Outgoing Mail Box, you can edit the send setting or the email in any normal way.
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