On Registration Form, if some fields are not mandatory to fill then those field

On Registration Form, if some fields are not mandatory to
fill then those fields can accept any invalid input. OR
there may have some validation.
E.g. Email id field - Not mandatory to fill.
If user enter Email id = 453454 should it accept?

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On Registration Form, if some fields are not mandatory to fill then those fields can accept any inv..

Answer / ashish

An e-mail address is generally recognized as having two
parts joined with an at-sign (@); this in itself is a basic
form of validation. However, the technical specification
detailed in RFC 822 and subsequent RFCs goes far beyond
this, offering very complex and strict restrictions

RFC invalid e-mail addresses
Abc.example.com (character @ is missing)
Abc.@example.com (character dot(.) is last in local part)
Abc..123@example.com (character dot(.) is double)
A@b@c@example.com (only one @ is allowed outside quotations
marks)
()[]\;:,<>@example.com (none of the characters before the @
in this example are allowed outside quotation marks

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