As I've mentioned before on your threads, Asian English has distinct differences to British English (primarily because Asian English tends to follow the patterns of Hindi, with very limited use of articles and pronouns). So what might be correct in an Asian English could still appear totally wrong in British English. Therefore you need to read any answers given here with caution, as they're only telling you what is correct here in Britain.
However here's how I'd amend your text:
"Xyz
I have spoken to my boss (Fred Bloggs) about the development of a propoed mobile application, which you referred to in your email/letter/phone call.
He suggests that, if you wish to proceed further, you should submit a formal application to our company in order that we can then respond with an appropriate proposal.
In the meantime, if you wish to discuss the matter further, please feel free to contact Fred directly, either by email (
[email protected]) or on his mobile number (01234 567 890).
Regards,
Fatema"