I frequently use sentences such as:
Please share information about X with me.
Please let me know if I can help you further.
I tend to end sentences that I begin with a full stop. I don't recall where I learned to do this. One of my colleagues recently suggested that I use a question mark at the end of a sentence (typically a request) beginning with "Please" with a question mark to make it clearer that this is a request.
I can't seem to find a grammatical rule or guideline about this. Please would someone either help clarify this for me, or point me in the right direction. Thank you.