coderhs/validate_mx_record — pull request #3 by mukesh-rk (2013-04-08 05:17:11+00:00)
Title: [BugFix] issue#2: added regex validation to email

checks email using /\b[A-Z0-9._%a-z\-]+@(?:[A-Z0-9a-z\-]+\.)+[A-Za-z]{2,4}\z/ along with mail_servers.empty?