If you lose access to your email linked to your Sui wallet, you will also lose access to your wallet.

Sui wallets do not rely on email for access or recovery. Your wallet is controlled by a cryptographic key pair generated locally, typically secured by a 24-word recovery phrase. If you lose access to your email, it does not affect your ability to use your Sui wallet, as long as you still have your recovery phrase or wallet file. There is no account recovery mechanism tied to email. If you lose both your device and recovery phrase, you permanently lose access to your assets. Always store your recovery phrase securely offline.