The best alternatives to Mail Pilot are Canary Mail, Flow-e, and Yanado. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Turn your Gmail or Office 365 inbox into a visual task board with Flow-e. Delegate tasks, manage to-dos, schedule meetings, and set deadlines from your inbox.