Mailbutler Smart Assistant

mailbutler.io

From $7/mo Free plan WebWindowsmacOSLinuxiOSAndroid

Spec score 9.4 #2 of 142 in Email clients

What it is

Mailbutler Smart Assistant adds AI writing and email-management tools to Apple Mail, Microsoft Outlook, and Gmail. It drafts messages from keywords or prepares replies using details a user supplies, with controls for format, length, style, tone, and language. It can summarize selected emails, identify to-dos for Mailbutler Tasks, and suggest spelling and grammar improvements to drafts. Mailbutler says the assistant uses OpenAI GPT-4o. Smart Assistant is included in a 14-day trial, then requires a Smart or Business subscription. The separate free Starter plan includes a visible Mailbutler watermark on sent emails. Mailbutler says email subjects and bodies are processed by Microsoft Azure OpenAI Service in the EU, with personal data redacted before submission to the underlying model. It also says backend data is encrypted and that it is ISO/IEC 27001 certified and GDPR compliant. Apple Mail support is listed for macOS Tahoe, Sequoia, Sonoma, and Ventura; mobile apps require iOS 15 or later or Android 7 or later.

Spec sheet

What it does: Mailbutler adds AI writing, tracking, scheduling, collaboration and signature tools inside Apple Mail, Gmail and Outlook.Read 15 Oct 2026 · mailbutler.io
Product: Mailbutler presents Smart Assistant as an AI email assistant for Apple Mail, Gmail, and Outlook.Read 29 Sep 2026 · mailbutler.io
Free plan: YesRead 19 Sep 2026 · mailbutler.io
Paid from: 4Read 19 Sep 2026 · mailbutler.io
Integrations: Business plans sync tracking events with HubSpot and Salesforce and support Google Analytics 4 UTM data.Read 15 Oct 2026 · mailbutler.io
Security: Mailbutler says it is ISO/IEC 27001 certified and GDPR compliant, and that backend data is encrypted.Read 29 Sep 2026 · mailbutler.io
Support: Mailbutler says its customer support team answers queries 24/7 and provides a Support Center.Read 29 Sep 2026 · mailbutler.io
Headquarters: Berlin, GermanyRead 28 Sep 2026 · mailbutler.io
Founded: 2015Read 28 Sep 2026 · mailbutler.io
AI data processing: Mailbutler’s GDPR page says email body and subject are processed by Microsoft Azure OpenAI Service in the EU for Smart Assistant, with personal data redacted before submission to the underlying model.Read 29 Sep 2026 · mailbutler.io
AI model: The Smart Assistant uses OpenAI GPT-4o.Read 15 Oct 2026 · mailbutler.io
AI tuning: The assistant can tune generated text by format, length, style, tone and language.Read 15 Oct 2026 · mailbutler.io
Cloud hosting: SoftwareWorld lists Mailbutler as cloud hosted and says an API is unavailable.Read 15 Oct 2026 · softwareworld.co
Company founded: Mailbutler was founded in 2015 and its product launched in March 2016.Read 15 Oct 2026 · linkedin.com
Company legal name: The company is Mailbutler GmbH, registered in Berlin under HRB 166863 B.Read 15 Oct 2026 · mailbutler.io
Compatibility limits: Mailbutler lists Apple Mail support on macOS Tahoe, Sequoia, Sonoma, and Ventura; Gmail support on macOS, Windows, and Linux; and mobile apps for iOS 15 or later and Android 7 or later.Read 29 Sep 2026 · help.mailbutler.io
Compose and reply: It drafts emails from keywords and generates replies, with an option to supply details for the response.Read 29 Sep 2026 · mailbutler.io
Documentation: The support center lists 16 getting-started, 10 tracking, 6 tailored-sending, 11 collaboration, 3 signature, 7 subscription, 5 troubleshooting and 2 FAQ articles.Read 15 Oct 2026 · help.mailbutler.io
Email clients: The assistant works with Apple Mail, Microsoft Outlook, and Gmail.Read 29 Sep 2026 · mailbutler.io
Email tracking: Tracking reports opens, link clicks, timing, location and device information, with per-recipient detail on higher tiers.Read 15 Oct 2026 · mailbutler.io
Improve drafts: Smart Improve suggests spelling and grammar improvements for a written email.Read 29 Sep 2026 · mailbutler.io
Licence: The terms license proprietary software, prohibit sublicensing, reverse engineering and derivative works, and allow use on up to two computers by one user.Read 15 Oct 2026 · mailbutler.io
Limit: Apple platform dependence: Reviewers note that Apple Mail plug-in conflicts and limited iOS or iPadOS functionality reduce coverage on Apple devices.Read 15 Oct 2026 · trustradius.com
Limit: interface complexity: Reviewers report that the interface can feel clunky, organization is unclear and some functions are difficult to find.Read 15 Oct 2026 · g2.com
Limit: pricing: Capterra, Software Advice and GetApp reviewers say higher tiers or organization-wide deployment can be expensive.Read 15 Oct 2026 · softwareadvice.com
Limit: tracking accuracy: Trustpilot and SoftwareWorld reviewers report unreliable tracking in some Outlook, Apple Mail or provider configurations.Read 15 Oct 2026 · trustpilot.com
Mail Merge: Mail Merge personalizes templates using Apple, Google or Outlook Contacts, HubSpot, Salesforce or CSV data.Read 15 Oct 2026 · mailbutler-support.instantdocsbase.com
Microsoft permissions: The Outlook add-in uses delegated Microsoft Graph Mail.ReadWrite and Mail.Send permissions and no additional APIs.Read 15 Oct 2026 · learn.microsoft.com
Mobile requirements: The mobile app requires iOS 15 or later or Android 7 or later.Read 15 Oct 2026 · help.mailbutler.io
Plan requirement: Smart Assistant is included in the 14-day trial and requires a Smart or Business subscription afterward.Read 29 Sep 2026 · mailbutler.io
Praise: support: Several G2 and Trustpilot reviewers describe customer support as responsive and helpful.Read 15 Oct 2026 · g2.com
Praise: tracking and scheduling: G2, TrustRadius, GetApp and App Store reviewers repeatedly praise reliable open tracking, delayed sending, scheduling and follow-up reminders.Read 15 Oct 2026 · g2.com
Privacy location: Mailbutler says its servers are in the EU and that it is GDPR compliant and does not share user data with third parties.Read 15 Oct 2026 · mailbutler.io
Public API: An independent directory reports that Mailbutler has no publicly documented API or MCP support and is operated through its user interface.Read 15 Oct 2026 · vanderbuild.co
Rating on Apple App Store: 4.2 out of 5 from 282 ratings.Read 15 Oct 2026 · apps.apple.com
Rating on Capterra: 4.7 out of 5 from 90 reviews.Read 15 Oct 2026 · capterra.com
Rating on Chrome Web Store: 4.6 out of 5 from 69 ratings.Read 15 Oct 2026 · chromewebstore.google.com
Rating on G2: 4.5 out of 5 from 65 reviews.Read 15 Oct 2026 · g2.com
Rating on GetApp: 4.7 out of 5 from 91 reviews.Read 15 Oct 2026 · getapp.com.au
Rating on Google Play: 3.3 out of 5 from 100 reviews.Read 15 Oct 2026 · play.google.com
Rating on Microsoft AppSource: 4.5 out of 5 from 54 ratings.Read 15 Oct 2026 · appsource.microsoft.com
Rating on Software Advice: 4.7 out of 5 from 90 reviews.Read 15 Oct 2026 · softwareadvice.com
Rating on Trustpilot: 2.5 out of 5 from 248 reviews.Read 15 Oct 2026 · trustpilot.com
Rating on TrustRadius: 10 out of 10 from 4 reviews.Read 15 Oct 2026 · trustradius.com
Scheduling limit: Mailbutler warns that scheduling more than 100 emails may cause failed delivery.Read 15 Oct 2026 · help.mailbutler.io
Security certification: Microsoft’s certification record marks application security, operational security, data handling security and GDPR controls as passed or in scope.Read 15 Oct 2026 · learn.microsoft.com
Smart Compose: Smart Compose drafts an email from a few keywords and can generate reply text.Read 15 Oct 2026 · mailbutler.io
Smart Follow-ups: Smart Follow-ups classifies tracked messages by urgency and can draft personalized follow-up emails.Read 15 Oct 2026 · mailbutler.io
Smart Improve: Smart Improve checks spelling and grammar and suggests clearer phrasing and tone.Read 15 Oct 2026 · mailbutler.io
Smart Respond: Smart Respond generates replies and lets the user supply extra details for the response.Read 15 Oct 2026 · mailbutler.io
Smart Summarize: Smart Summarize produces an overview of the important details in an email.Read 15 Oct 2026 · mailbutler.io
Summaries and tasks: It summarizes selected emails and finds to-dos that users can add to Mailbutler Tasks.Read 29 Sep 2026 · mailbutler.io
Supported systems: Apple Mail supports macOS Ventura through Golden Gate; Gmail supports macOS, Windows and Linux with Chrome, Safari or Edge; Outlook supports macOS and Windows.Read 15 Oct 2026 · help.mailbutler.io
Task Finder: Task Finder scans messages for actionable to-dos that can be saved as Mailbutler tasks.Read 15 Oct 2026 · mailbutler.io
Writing controls: Its tuning option lets users adjust generated text’s format, length, style, tone, and language.Read 29 Sep 2026 · mailbutler.io

Plans and prices

Starter Free free forever; 14-day trial converts automatically Starter features · visible Mailbutler watermark Read 15 Oct 2026 · mailbutler.io

Professional $9 a month $9 monthly or $7 monthly on yearly billing per user tracking · templates · mail merge · inbox collaboration · automations · signatures Read 15 Oct 2026 · mailbutler.io

Smart $14 a month $14 monthly or $11 monthly on yearly billing per user AI Smart Compose · Smart Improve · Smart Summarize · Task Finder · Smart Follow-ups · per-recipient tracking Read 15 Oct 2026 · mailbutler.io

Business $32 a month $32 monthly or $24 monthly on yearly billing per user all Smart features · CRM tracking sync · custom tracking subdomain · IP blacklisting · UTM personalization · dynamic signature content Read 15 Oct 2026 · mailbutler.io

Professional (yearly billing) $7 a month Per user per month with yearly billing Email tracking · Templates and mail merge · Inbox collaboration · Signature marketing Read 29 Sep 2026 · mailbutler.io

Professional (monthly billing) $9 a month Per user per month Email tracking · Templates and mail merge · Inbox collaboration · Signature marketing Read 29 Sep 2026 · mailbutler.io

Smart (yearly billing) $11 a month Per user per month with yearly billing Smart Assistant · Smart Follow-ups · Email tracking · Mail merge · Inbox collaboration Read 29 Sep 2026 · mailbutler.io

Smart (monthly billing) $14 a month Per user per month Smart Assistant · Smart Follow-ups · Email tracking · Mail merge · Inbox collaboration Read 29 Sep 2026 · mailbutler.io

Business (yearly billing) $24 a month Per user per month with yearly billing Smart Assistant · Smart Follow-ups · CRM tracking sync · Custom subdomain · IP blacklisting Read 29 Sep 2026 · mailbutler.io

Business (monthly billing) $32 a month Per user per month Smart Assistant · Smart Follow-ups · CRM tracking sync · Custom subdomain · IP blacklisting Read 29 Sep 2026 · mailbutler.io

Every Mailbutler Smart Assistant plan and price →

Strong points and limits

Strong points

Drafts messages and replies with adjustable writing controls
Finds to-dos for Mailbutler Tasks
Summarizes selected emails
Suggests spelling and grammar improvements

Limits

Smart Assistant requires a paid subscription after 14 days
Free Starter adds a visible email watermark
Mobile apps require iOS 15 or Android 7 or later

Who it suits

It suits people who want help drafting, improving, summarizing, and organizing email in Apple Mail, Outlook, or Gmail. Its Smart Assistant features require a Smart or Business subscription after the trial.

Mailbutler Smart Assistant in depth

Read the full write-up

Overview

Mailbutler Smart Assistant adds AI drafting and inbox organization to Apple Mail, Gmail, and Outlook. It best suits people who want help preparing messages and spotting follow-up work without handing over the send button. Its strongest case is the combination of writing tools, summaries, and task finding; the catch is that continued access starts at the Smart plan.

Key features

Smart Assistant can turn keywords into a draft or prepare a reply from details you provide. You can tune generated text by format, length, style, tone, and language, giving you useful control over how a draft reads. Smart Improve suggests spelling and grammar changes to a message you have already written. These are aids to composing, not automatic sending: you review and send messages yourself.

For inbox triage, the assistant can summarize selected emails and identify to-dos that you can add to Mailbutler Tasks. That pairing is useful when a message contains work to track as well as information to absorb. Mailbutler says Smart Assistant uses OpenAI GPT-4o. Its GDPR information says email subject and body are processed by Microsoft Azure OpenAI Service in the EU, with personal data redacted before submission to the underlying model. Mailbutler also says it is ISO/IEC 27001 certified and GDPR compliant, and that backend data is encrypted.

Mailbutler's broader service includes email tracking, templates, mail merge, inbox collaboration, and automations. Mail Merge can draw on Apple, Google, or Outlook Contacts, HubSpot or Salesforce, and CSV data; CRM tracking sync is offered for HubSpot and Salesforce on Business.

Pricing

Smart Assistant is included in the 14-day trial, then requires a Smart or Business subscription. Starter is free forever, but does not include the assistant and adds a visible Mailbutler watermark to sent email. It is suitable for trying the base service, not for ongoing AI assistance.

Professional: $7.00 per month billed annually, or $9.00 per month with monthly billing. It includes email tracking, templates and mail merge, inbox collaboration, and signature marketing, but not Smart Assistant. Choose it if those email tools matter more than AI drafting and task finding.

Smart: $11.00 per user per month with yearly billing, or $14.00 per user per month with monthly billing. It adds Smart Assistant and Smart Follow-ups alongside email tracking, mail merge, and inbox collaboration. This is the entry point for the assistant's composition, improvement, summary, and task features.

Business: $24.00 per user per month with yearly billing, or $32.00 per user per month with monthly billing. It includes Smart Assistant, Smart Follow-ups, CRM tracking sync, custom subdomain, and IP blacklisting; the broader plan also includes custom SMTP and advanced signature marketing. It fits teams that need the CRM and domain controls, rather than individuals seeking only AI email help.

Professional's lower price means giving up Smart Assistant, while Smart costs less than Business but omits Business's CRM sync and custom email controls. The plans are priced per user where stated, so team costs rise with seats. Mailbutler also describes a freemium model with paid access from $4/user/mo (annual); its specific Smart and Business prices above are the relevant entry points for Smart Assistant.

Platforms

The assistant works with Apple Mail, Gmail, and Microsoft Outlook. Compatibility is client-specific: Apple Mail support is listed for macOS Tahoe, Sequoia, Sonoma, and Ventura; Gmail support covers macOS, Windows, and Linux. Mobile apps support iOS 15 or later and Android 7 or later. The broader platform range is Android, iOS, macOS, Windows, Linux, web, and extension, but confirm that your particular email client and device combination is supported before subscribing.

Mailbutler says its support team answers queries 24/7 and provides a Support Center.

Who it's for

Choose Smart Assistant if you already work in Apple Mail, Gmail, or Outlook and want one subscription to help write, improve, summarize, and turn email into tracked tasks. It is less suitable if you need automatic sending, want AI help on the free or Professional plan, or require an email-client combination outside its stated compatibility.

Pros and cons

Pros: Drafting, adjustable writing controls, spelling and grammar suggestions, summaries, and task finding cover several stages of email work in one assistant.

Pros: It works with three major email clients, and Mailbutler describes EU processing with personal-data redaction before the underlying model receives content.

Cons: Ongoing Smart Assistant access requires Smart or Business; the free Starter and cheaper Professional plans do not include it.

Cons: Compatibility depends on both client and operating system, and replies are not sent automatically.

Cons: Business is a substantial step up in price over Smart, so its CRM sync and custom email controls need to justify the extra cost.

Alternatives

If tracking email activity is the priority rather than AI composition, compare Email Tracking Software and Sales Email Tracking Software. For a different balance of tracking and sequences, Mixmax has a free plan capped at 20 tracked emails and 50 sequence recipients per month, with Inbox Copilot at $29.00 per month. Yesware offers free basic open and attachment tracking, with 10 campaign recipients per month.

Boomerang is worth considering if Gmail/G Suite support, Send Later, and reminders matter most; its Basic plan includes 10 message credits per month, and Personal costs $4.98 per month. Mailtrack is another option when tracked-email volume is the focus: its free plan includes unlimited tracked emails, with the first open logged and a promotional signature. If you want a broader email-client choice before choosing an assistant, see Email clients. For other assistant options, browse AI Email Assistants.

KudosCRM, Streak, Salesforce Sales Cloud, and Apollo are also alternatives.

Verdict

Mailbutler Smart Assistant is a good fit for people who want composition help and practical inbox triage inside Apple Mail, Gmail, or Outlook. Its mix of drafting, revision, summaries, and task extraction is the reason to choose it. Look elsewhere if you need automatic sending, a free AI tier, or a simpler client-independent setup; otherwise, Smart is the plan to compare first.

Verdict

Smart Assistant combines composition help with summaries and task finding across three email clients. Check the subscription requirement and client-specific compatibility before relying on it.