However, it's important to note that "mail relative" is not a real word. It's a combination of "mail" (referring to the postal system) and "relative" (referring to a family member).
It's likely that you're looking for the homophone of a specific male relative, such as:
* Uncle: The homophone is unkle, though this is a very uncommon spelling.
* Son: The homophone is sun.
* Brother: The homophone is brother.
Please clarify your question if you're looking for the homophone of a specific male relative.