Add possibility to insert 'email' about matrix-registration

[zeratax]

sadly this isn't exactly trivial, since the admin register api endpoint doesn't take an email address. the only way around this to me seems to be to completely rewrite this to something akin to an ldap provider.

currently I would just recommend users to add their email address after they've signed up

[Bubu]

This seems to take an email though? https://github.com/matrix-org/synapse/blob/develop/docs/admin_api/user_admin_api.rst#create-or-modify-account

I just very briefly looked this up, so I might be looking at the wrong thing. As I'm quite interested in something like this as well, I'd be wiling to spend some more time researching this.

[zeratax]

Oh yeah this does look promising. I was just looking at the inital register endpoint. I guess this wouldn't check if this 3pid is actually yours, by in this case sending a verification email? Depending on how much of an issue that is I would probably have to send those myself, though a good opportunity to consider #19 again

[xelantro]

E-mails are normally managed through the identity server (of their own choice), which also provides an email verification api interface relevant matrix api.
But since Synapse 1.4 (~2019) synapse safes their own 3pids for password reset see here since babus link is dead, but this would need an admin access-token.

Alternativly the client-server api seems to provide an interface which comes hand since we get an accesstoken from the user as response from the registering https://matrix.org/docs/spec/client_server/r0.6.1#post-matrix-client-r0-register-email-requesttoken