Making one’s Messenger topic a du‘aa’ (supplication) or word of wisdom
Question

                There are “topics” for Messenger of different types, including some that are called Islamic topics. I chose one of these topics for my e-mail. Is it permissible for me to do that? Please note that chat or writing begins with this Islamic topic that I chose.
Praise be to Allah.There is nothing wrong with using
Messenger topics and choosing useful words, or beneficial supplications, or
good lines of poetry. That will serve as a reminder to one’s friends, and will
prompt and remind them to do good and obey Allah.
And Allah knows best.