open(MAILPIPE,'|/bin/mailx -s "Happy Birthday" $email') or die "Can't open pipe $!";

Output
======

                    IST TIMEZONE SET

        Date and time - Thu Dec 24 14:32:03 2015
        BirthdayPerson name is Mallikarjun Gowda
        Birthdate is 2412
        timezone is IST
        Gender is him
        Email is email@provider.com
        Mallikarjun Gowda has birthday today
        Remember to Wish him a very Happy Birthday
You must specify direct recipients with -s, -c, or -b.