The Manager,
This is to most courteously inform you that I am working as ___________ (mention designation) in your company. My name is _________ (name) and my employee ID is __________ (mention employee ID).
I would like to state that I recently received an offer letter __________ (mention offer letter number) from your company and I am joining your company from __/__/____ (date) onwards. As per the conditions mentioned in the joining contract, I am entitled to a relocation bonus from your company. I am writing this email to request you to proceed further with the same.
I shall be highly obliged for your response.
Thankful as always,
[Digital Signature]
____________ (Signature)
____________ (Name),
____________ (Contact details)