MailMESH

MailMesh is a software as a service API that checks email addresses to see if they are throw away emails like the email addresses provided by services like mailinator.com or 10minutemail.com. Developers can make a request to https://api.mailmesh.io/test@mailinator.com and receive a response that indicates whether the email address is on a blacklist of disposable email providers.
The concept is combining a Mail icon with Filter Tool and overall the logo looks like a Shield.