Describe the bug
Domains like example@my.americanfamily show up as invalid with the current regex found here.
https://github.com/Orcpub/orcpub/blob/develop/src/cljc/orcpub/registration.cljc#L35

RFC1034 says they can be up to 63 characters

Each node has a label, which is zero to 63 octets in length.
https://tools.ietf.org/html/rfc1034