"normalizes" an email to prevent multiple accounts being created for each email inbox. This would be ran on both register and login.
We don't DNS lookup gsuite because gsuite does not have the gmail "plus address" feature.
License:
Copyright 2019 github.com/judge2020
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: