Email validation | Login & signup: User can login or signup with invalid email address

[samuko-things]

Issue description

In the API server, we want to ensure that A user signup or logging with a valid email address. for example, if a user just enters straight text: maryhasalittlelamp or maryhasalittlelamp.com or maryhasalittlelamp@ etc. instead of something with a recognizable email extension like [email protected] (for example: [email protected], [email protected] etc), it should return an error.
We want this validation to be done when the POST request is sent.

Expected behaviour

• User should not be able to signup or login with an invalid email address.
• Validation should be done when a POST request is received.
• Bounces user back immediately the API notices an email that doesn't match the usual email patterns (e.g [email protected], etc.)

Additional context

• Repo URL: https://github.com/collabo-community/api-server

Testing checklist

Note (to contributor taking on this task assignment): Add the testing checklist below (without this note) to your pull request when submitting your fix. This will guide (you and) the contributors who will review your fix to know what is important to check or test for.

• User cannot signup or login with an invalid email address.
• Validation is done when a POST request is received.
• Bounces user back immediately the API notices an email that doesn't match the usual email patterns (e.g [email protected], etc.)
• I certify that I ran my checklist