French phrase
Je vous remercie de la part de ~.
Meaning
I would like to thank you on behalf of ___.
When to use it
A formal way to thank someone for another person. It is polite and common in official or business settings.
Example dialogue
Je vous remercie de la part de Monsieur Dupont.
I would like to thank you on behalf of Mr. Dupont.
Merci, je lui transmettrai.
Thank you, I will pass it on to him.