The best alternatives to Spam Mail Tester are mjml., Email Testing By Inbox Pirates, and Vetter. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Multilingual Speech-to-Text API with superhuman accuracy
MJML is a markup language designed to reduce the pain of coding a responsive email. Its semantic syntax makes it easy and straightforward and its rich standard components library speeds up your development time and lightens your email codebase.
It's time to get rid of send button anxiety and boost email opens with Inboxpirates. With our tool, you can see where your subject line gets cut off, how your emails look on different email clients and devices, and even how they look with notification bars.
Vetter allows you to safely determine whether an email you wish to send will be marked as spam. This is done by testing the email against a network of real email accounts, and checking whether it ended up in inboxes or was spammed.