And all that time I thought that email with MadDoc's secretary was sent from him... jk.
Ask her to look at the headers of the email (or forward them to you), that's where it can become apparent where it is actually coming from. People spoof emails all the time, but server paths/IPs are in the headers. It could actually be her account/PC that's being compromised.
Other than that seems you know what you're doing (not reusing emails, etc.)
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