How to add the ability to register email?

How to add the ability to log email that will not let me asp.net identity ?
for example here is a test+a@gmail.com?
this email shows as incorrect.

*not to use asp.net identity - not true, there is a Bicycle - it is necessary to use
July 8th 19 at 11:24
1 answer
July 8th 19 at 11:26
Judging by the code(identiti on github) , you need to use your own uservalidator.

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