Burner Mail is described as 'Helps you protect your privacy by providing you with custom email addresses (burner emails) that can be used to forward all incoming emails to your personal account' and is a disposable email service in the security & privacy category. There are more than 100 alternatives to Burner Mail for a variety of platforms, including Web-based, Google Chrome, Android, SaaS and Mozilla Firefox apps. The best Burner Mail alternative is addy.io, which is both free and Open Source. Other great apps like Burner Mail are MailDrop, Firefox Relay, Guerrilla Mail and TemporaryMail.
lockrMail has many benefits compared with burnermail: works on mobile, works offline (i.e. a receipt from a coffee shop), advanced filters beyond on/off toggling, access to archived messages, and of course, it is free!