Hello Arush,

First of all many congratulations :) to you for being placed and now come to your query so let me make you clear the company will send you an offer letter on the same e-mail ID on which they have sent your all interview or test links and as you have mentioned that you have received AMCAT links through your primary e-mail ID so the offer letter will also be shared on the same e-mail ID until and unless you change it.

I hope this information helps you.

Good Luck!!