Are there exceptions for saying ﷺ or obligatory to say it every time his name ‎ﷺ is mentioned? Like after Shahaadah, Iqamah. And what if an enemy of Islam comes to you saying: „Muhammad (‎ﷺ), Muhammad (‎ﷺ), Muhammad (‎ﷺ)…“ When praying & some1 walks past & mentions name DoWeHaveToSay ﷺ afterwards?

Some of the people of ilm mentioned that it is mandatory the 1st time it is mentioned in the sitting. the rest is a sunnah, As for the disbeliever that comes to you saying it like this, alhamdulilah hasanat being sent your way, and you can stop after a while no problem as we said as it is favored after the 1st time.