Allow modifying the e-mail address during SSO registration

Contribute Feature
1

When I register for a Discourse account via OAuth2 SSO, I am forced to register with the e-mail address that was assigned to the account that I am registering with. However, this is antithetical to how I utilise e-mail addresses:

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https://superuser.com/questions/1848533/can-e-mail-messages-be-sent-from-a-plus-address-via-thunderbird-smtp#comment2926854_1848540

Consequently (but — also — regardless), I should be able to choose the e-mail address that I register with.

The reason that I care about this is that I create a lot of accounts at try.discourse.org., [1] because:

…so SSO saves me some time, by pre-filling some information. However, if I choose Discourse ID, a rather undesirable e-mail address is utilised, because:

I wonder whether this relates to:

  1. linuxcommunity.io/t/13115 ↩︎