This guide will use Mailchain with thirdweb to send messages to your users after they claim your drop. Mailchain is a protocol that lets you message other wallets. It also functions as the email of web3, making it flexible to fit different tasks. In our case, we will send a mail to a user's wallet address after they have claimed the NFT drop.
We will cover how you can set up Mailchain, create an NFT drop contract on thirdweb and finally create a dApp integrating both to provide users a seamless experience for claiming the drops.
You can also find the step-by-step written tutorial here: https://blog.thirdweb.com/guides/notify-drop-claimers-using-mailchain/