Check email domain validity

[sowmi20189]

Summary

As as admin, I want the email address field to be domain validated across the application wherever applicable.

Things to Consider

Currently, the field takes anything @.com and does not validate the domain.

Criteria for Completion

• When the user enters an email address, the system must validate the domain
• If the user enters an invalid email address (wrong spelling, invalid domain, numbers, special symbols, etc.), the system must throw a warning message that says "Please enter a valid email address"

Screenshot for reference will be available soon.

[JelenaD1]

@garettarrowood I've come across truemail gem that handles email verification and it seems it's maintained well. What you think? https://github.com/truemail-rb/truemail#code-of-conduct