That was for the Stone Age. Times have changed. Instead of "sending regards", pick up your phone [which is easy b/c it is probably already in your hand] and CALL!! Say "How are you? I was thinking of you! What is new??" Or at least text or email.
That would be a cool "ואהבת לרעך כמוך" move. No less a mitzva than wearing tefillin or sitting in a Succah on Succos.
Really.
