The best alternatives to ValidSheet are Trumail, Email Verification Tool, and NeverBounce. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Trumail is a fast and accurate email address verification API written entirely in Go. It was built with the intention of providing software engineers and businesses with a simple and easy to use solution to bounced emails.
An ideal email verification platform to clean up your bulk-email lists from honeypots, hard bounces, and non-valid emails to keep your sender reputation and email deliverability.