Q: Is it permissible that on someone’s birthday, you send them a message in which you don’t wish them ‘happy birthday’, but you make dua for them e.g. May Allah keep you happy, grant you prosperity, etc?
A: If the message has no connotation of the birthday in it and is only Du’aa, then it will be permissible.
Allah Ta’aala knows best.
Moulana Yusuf Laher