[pylon]

Out of curiosity, is your customdomain in this case something without any personal info on it? I have a custom domain with my first name and last name initial .com, but now I'm thinking if I want this setup, maybe it's better off getting a domain with random words so even if email leaks, no personal data is leaked.

[e12e]

I'm not currently using it (took down my opensmtpd server.. Haven't replaced it yet) - but I used a subdomain on a vanity domain (in my case things like [e-mail]). If I need a "new" domain, I can just move to another (r.hypertekst.net - s for spam, r for registration... Etc).

[WA]

Not OP, but same setup. I have a custom domain that has a generic name. Not entirely random just in case I ever have to spell it out or something, but no PII in the domain name. Also, Whois privacy service through my registrar.