Just go with the modern flow among the yungerleit who use the idiomatic “Yasher koach!” as a verbal “thumbs up” which more often than not is swallowed as a single sound “YassShhhKOICh. The more intriguing question is how many recipients immediately respond with a heartfelt “Baruch Tihiyheeyeh” which a less modernishe yid might translate colloquially as “Back atcha!”
