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I also ended up with "mail.substack.com" (along with mail@substack.com) while testing. I couldn't see an admin site, but I did get a confirmation email. Please

by radley 9y ago

I also ended up with "mail.substack.com" (along with mail@substack.com) while testing. I couldn't see an admin site, but I did get a confirmation email. Please delete the account (and my apologies for the hassle).

jlgaddis 9y ago
Nice. If one can grab "admin", "webmaster", or one of several others, she can also get SSL certificates for the domain.