nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqw93zt90nd6vj39edv5j5af8cm87tqkaesckhwgzq6f4erwhfmz9qgp063m (nprofile…063m) no, the addresses alone are pointless, so it is not like with guessing phone numbers in other platforms,
to write to someone in ArcaneChat you need their invitation link or QR which upon use grants you access to the contact's public key, the encryption key is what allows you to write to a person and not their (random) email address
since only encrypted email is allowed if you discover an address the only thing you can do is see the server reject your attemts to send unencrypted email