I take my privacy very seriously thus ensure to read WP:ASIC first as a prerequisite to sending me an e-mail, so as to avoid being irate or feel belittled when I most definitely ignore your e-mail. Generally, if WP:OUTING isn't a factor to consider, for utmost transparency, leaving a message on my talk-page is my preferred manner of communication.
In any capacity whatsoever, by any editor here, I most definitely would not reply questions that may lead to me being doxed or possess the potential to me being doxed if I reply to them.
Except I initiate the mail I typically would only respond to system operators, functionaries, and very advanced anti spam editors.
If you have encountered undisclosed paid editing my email is not where to report this, rather forward your evidence to paid-en-wp@wikipedia.org or mail the WP:CHECKUSER team directly.
I reserve the right to share or redistribute your mail If you have come to offer me financial rewards in order for me to “look the other way” I would forward the mail to WP:ARBCOM.
