You can always log in to MailExpress from https://app.mailexpress.com/
Clicked Forgot Password below the login button, and enter your account's email, you can reset your password. If you didn't get the reset password email in your inbox, please check your spam folder or try to resend another email.
Your login email is the email that you used to sign up for our services. If you forgot it, don't worry, our support team has you covered, please submit a request with your name and organization name, and our support team will contact you on any additional steps needed.