MAzal Tov

 

מזל טוב Saying "מזל טוב" to the בעלי שמחה  on T.B'av is not considered שאילת שלום and is permitted (שו"ת שלמת חיים R.YCh. Zonenfeld zt"l)           Hello, Goodbye, Good morning. Good Evening, Sefer Leket Yosher (Talmid of Terumas Hadeshen) quotes from the Terumas Hadeshen  "The Issur* of שאילת שלום  is only when the  word שלום is used. Saying Good Evening etc.  is allowed**." * Aveilus & Tisha B'av ** The T.H.  wouldn't  personally rely on his  own Heter.