[kwanbix]

Side Note for Lenny, in case he is reading: whenever I try to add my email, I get "We were unable to validate your email domain". Of course my email is valid. I just use a forwarder email address, mixed with a catch all, so that I can do [e-mail]. But your website would not accept it. It is the only ever website that rejects it. Of course I would never give my real email.

[remram]

If you're using escribime dot com (as per your profile page), you're missing an MX record. Software will usually default to the A record in this case but that's not exactly standard.

edit: it also refused my connection on port 25

[lennysan]

Oh hi! That's very strange indeed. Have you tried emailing Substack support? I'm not doing anything weird here.

[dustincoates]

That's strange. I do the same thing and Substack (and specifically Lenny's newsletter) accepts it okay.