Mailbutler Smart Assistant

Categories: Productivity, Automation / Agents | Pricing: Freemium | Official Website ↗

AI email assistant for Apple Mail, Gmail, and Outlook that composes, replies, summarizes, and improves emails using GPT-4o.

Mailbutler's Smart Assistant is an AI-powered email extension for Apple Mail, Gmail, and Outlook that integrates GPT-4o directly into your email client sidebar. It can compose emails from a few keywords, auto-generate replies (positive, negative, or detail-sharing), summarize long threads, extract action items as tasks, and improve spelling, grammar, tone, and clarity. The Smart Assistant also provides smart follow-up suggestions based on engagement signals and supports tunable output — users can customize format, length, style, tone, and language. Available on the Smart plan ($14/user/month) and above; a 14-day full-featured free trial is included.

Key Features

AI email composition from keywords (Smart Compose)
Auto-generated email replies with tone control
Email summarization (Smart Summarize)
Spelling, grammar, and tone improvement (Smart Improve)
Action item extraction to task list (Smart Task Finder)
AI-powered follow-up suggestions (Smart Follow-ups)
Tunable output — format, length, style, tone, language
Works in Apple Mail, Gmail, and Outlook

Pros

Integrated directly into existing email clients — no context switching
Powered by GPT-4o for high-quality output
Covers full email workflow: compose, reply, summarize, improve, extract tasks
GDPR compliant with EU-based servers
14-day free trial with all features

Cons

AI features require Smart plan ($14/user/month) or higher
No standalone web app — requires email client extension
API access not available for the AI assistant

Use Cases

Drafting professional emails from brief keyword prompts
Auto-generating email replies to save time
Summarizing long email threads at a glance
Extracting to-do items from incoming emails
Improving tone and grammar before sending

Integrations: Apple Mail, Gmail, Microsoft Outlook, HubSpot, Salesforce, Apple Contacts, Google Contacts

Platforms: macOS, iOS, Web (Gmail), Windows (Outlook)

Watch demo on YouTube ↗

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