The best alternatives to Thinbox are Mailytics, MailSlurp, and Gmail Meter. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Create real, private email addresses on demand. Send and receive emails and attachments in application code and integration tests. Intuitive REST APIs and SDK Libraries. Free for personal use.
We all know that email is broken. You share your email address, and before you know it, your inbox is overflowing with hundreds of messages every day. We're working on resolving a lot of the email productivity issues you're having right now.