Unfortunately I couldn't think of a neutral name unlike in other email fields of my online form like
E-Mail der Projektleitung.
Also it is very important in my company to list both genders if no neutral word is possible. Unfortunately there's not enough space to spell out
E-Mail der Antragstellerin/ des Antragstellers.
Is my suggestion in the question perfectly fine or would you do it differently? I'm unsure because I can't remember seeing this before.