"INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for " message being displayed when mails being sent from or to mail ID

"INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for " message being displayed when mails being sent from or to mail ID

"INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :Verification failed for " message being displayed when mails being sent from or to mail ID. Unable to exchange mails for internal users as well.