If you don't like the sound of using any software, then ProtonMail provide free email accounts where you can get a PGP enabled email address by default.
I'm currently in the process of creating a Protonmail account. That turns out to be a lot more difficult than I ever expected if I don't want to give them my creditcard. To be continued ....
Given my position, good OPSEC is paramount I'm afraid. I can understand why other Mixers may have been reluctant to share their addresses in the past. I'm going out on a limb trusting someone who I don't know as it is. What I can't do is send that kind of information in clear text on this forum in a private message where the admins of this site can also see it and where it gets stored forever in their database.
Cloudflare is probably a much bigger risk than Bitcointalk Admin:
So it's not blatantly insecure except in that Cloudflare is very probably an NSA honeypot, and it's not like the NSA is going to steal your password in order to scam people on bitcointalk.org or anything. If you use PGP for important communications and use a unique password, then IMO this addresses the plausible attacks well enough.