[GENERAL] Build in function to verify email addresses - Mailing list pgsql-general

I beleieve that every information system has the needs to send emails.
Currently PostgreSQL doesn't have a function which gets TEXT and return true if it's valid email address (xxx@YYY.com / .co.ZZ)
Do you believe such function should exist in PostgreSQL or it's best to let every user to implement his own function?

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