A stronger reason: the point of validating email addresses is to prevent user error, such as putting their name in the email field. It is not to ensure emails are RFC compliant. In fact you probably want to allow non-RFC compliant email addresses because there is a chance it still may work - not all servers are going to be RFC compliant and as a product it is not your job to enforce obscure Internet rules.

Personally I test for @ and . with any characters surrounding.