Please change the SPX Trigger to something more reliable. It's very easy to mistype the subject line to e.g. "[secure:someting]" instead of "[secur:someting]". In this case the mail will be sent unencrypted.
I think about an one-letter-trigger like a leading !,$,or %. So if the subject line starts with %verysecretpassword, the eMail will be encrypted.
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