Last updated 08-12-2026
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MailMaestro
MailMaestro is an email assistant that runs inside Microsoft Outlook and Gmail, not a separate inbox app. You compose, reply, improve drafts, and triage threads from a sidebar in the email client you already use. Maestro Labs sells it as part of a Microsoft 365 productivity suite alongside TeamsMaestro and WordMaestro.
Most AI writers are browser tabs or copy-paste tools. MailMaestro reads the full thread and attachments before drafting, then offers three options per action. Auto-labels sort mail into categories like To Respond and FYI, and Rapid Replies cut response time on routine threads. AI Priority Inbox and sharing summaries to MS Teams are Outlook-only, which is a real split if your team mixes Gmail and Outlook users.
The free plan caps compose, reply, and improve at three requests per week total. Paid seats unlock summarization, attachment digests, and meeting scheduling at $15 per month or $12 on annual billing. It fits professionals and teams who want drafting help without leaving Outlook or Gmail.
Compose, Reply, and Improve each return three draft options using GPT-4o and Claude 3.5
Summarize full email threads and attachments including PDFs, Word files, and presentations
Auto-label inbox into categories such as To Respond, FYI, and Marketing with a priority view
Rapid Replies generate contextual one-click responses from thread summaries
Write and reply in 18 languages with tone, length, and AI Personality style matching
Free plan includes Magic Templates; paid plans remove the MailMaestro watermark
Outlook add-in via Microsoft Marketplace and Gmail via Chrome Web Store, no separate install
Runs inside Outlook and Gmail with no separate app to open.
Summarizes threads and attachments before drafting replies.
Free tier needs no credit card and no software install beyond the extension.
SOC 2 Type II, GDPR, and HIPAA compliance with optional BAA.
Supports 18 languages for compose and reply actions.
Free plan limits compose, reply, and improve to three requests per week total.
AI Priority Inbox and MS Teams sharing work in Outlook only, not Gmail.
Summarization and advanced inbox tools require a paid Professional or Team seat.
Is MailMaestro free to use?
Yes. MailMaestro offers a Free plan at $0 per seat per month with compose, reply, improve, Magic Templates, and AI Personality. Compose, Reply, and Improve share a cap of three requests per week on the free tier.
Does MailMaestro work with Outlook and Gmail?
Yes. MailMaestro runs as an Outlook add-in from Microsoft Marketplace and as a Gmail Chrome extension from the Chrome Web Store. Both connect from inside your email client with no separate software download.
What languages does MailMaestro support?
MailMaestro supports 18 languages for composing and replying to email. You pick language, tone, and length before the tool generates drafts or responses.
What AI models does MailMaestro use?
MailMaestro uses GPT-4o and Claude 3.5, listed on its pricing page as the best LLMs in the market. The email writer, reply, and improve actions route through these models.
How much does MailMaestro Professional cost?
MailMaestro Professional is $15 per seat per month on monthly billing or $12 per seat per month on annual billing, which saves 20%. It adds email and attachment summarization, smart meeting scheduling, and AI Priority Inbox on Outlook.
How does MailMaestro protect my data?
MailMaestro is SOC 2 Type II certified, GDPR compliant, and HIPAA compliant with a BAA available on request. Enterprise clients can request zero-day data retention and PII obfuscation.