In the ever-changing landscape of digital communication, Artificial Intelligence (AI) is transforming the way we approach email writing. Explore the impact of intelligent algorithms and natural language processing in crafting engaging email content and optimizing delivery strategies in this blog series. Whether you’re a seasoned marketer or a communication professional, discover the powerful synergy between AI and effective email communication strategies.
Jul 24, 2026
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Simon L.
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13 min Read
The best AI email assistant tools are Hostinger Agentic Mail, Superhuman Mail, Gemini in Gmail, Microsoft Copilot for Outlook, Shortwave, SaneBox, Spark, Lindy, Fyxer, and MailMaestro. They support different email tasks, from drafting replies and summarizing threads to organizing inboxes and automating multi-step workflows.
The 10 AI email assistants covered in this article are:
Compare each tool’s product type, email compatibility, AI capabilities, limitations, and pricing to choose the best option for your workflow.
Tool/platform
Best for
Key AI features
Hostinger Agentic Mail
Developers, AI builders, and automation workflows
Webhooks, allow/block lists, no-code tool integrations
Superhuman Mail
Executives and high-volume inbox users
AI drafting, summaries, keyboard shortcuts, split inbox
Gemini in Gmail
Gmail and Google Workspace users
Drafting, thread summaries, AI Overviews, Workspace context
Microsoft Copilot for Outlook
Microsoft 365 and Outlook teams
Thread summaries, reply drafting, meeting follow-ups, Graph integration
Shortwave
Gmail users who want AI-powered search and summaries
Semantic search, thread summaries, smart bundles, task extraction
SaneBox
Users overwhelmed by email volume
Smart filtering, SaneLater folder, follow-up reminders, daily digest
Spark
Multi-account users who want AI writing and team features
Smart inbox, AI compose, team collaboration, cross-platform support
Lindy
Teams building multi-step AI agent workflows
Agent builder, email triage, scheduling, meeting notes
Fyxer
Busy professionals managing email and meetings
Style-matched drafts, inbox triage, meeting notes, follow-up tracking
MailMaestro
Users focused on writing clearer professional emails
AI drafting, tone adjustment, thread summaries, one-click replies
Hostinger built Agentic Mail as an programmable email infrastructure for AI agents and automated workflows for Premium Business Email users.
Rather than giving you a prettier inbox or a smarter compose button, it lets your mailbox talk directly to automation tools and integrate with AI agents like Claude. When an email arrives, your connected tools are notified instantly, so workflows can kick off without any manual checking or delays.
If you’re exploring what email hosting is and how it connects to automation, Agentic Mail is a good example of a hosted mailbox doing far more than sending and receiving messages.
The use cases look different from typical AI email assistants. Think bots that reply to customer emails, support systems that route tickets to the right team, or automated workflows that qualify and forward leads.
Agentic Mail comes included with Hostinger Premium Business Email, which starts at $1.99/month. That plan also includes 50 GB of storage per mailbox, AI-powered search, smart replies, email summaries, and a free domain for the first year.
Superhuman Mail is a premium AI email client built for speed. Every action has a keyboard shortcut, the interface strips away clutter, and AI handles drafting and summarizing so you spend less time on each message.
It’s aimed at executives, founders, sales professionals, and anyone whose inbox regularly hits triple digits. Split inbox separates important messages from everything else, AI drafting learns your tone over time, and follow-up reminders make sure nothing slips through.
This is a tool that only pays for itself if you’re genuinely drowning in email every day. If AI-powered search matters more to you than keyboard shortcuts, Shortwave is in a similar price range.
Paid plans with Mail start at $33/user/month. Superhuman Mail also offers a broader suite with sales and calendar features, but the Mail product is what’s relevant for email assistance. The entry-level Starter plan covers core AI features like Write with AI, thread summaries, and auto-reminders.
Since Superhuman Mail sits on top of Gmail or Outlook, you’re paying this on top of your existing email provider, which makes it a significant investment compared to built-in AI tools like Gemini or Copilot.
If you already work inside Gmail and Google Workspace, Gemini adds AI assistance without requiring anything new. It handles email drafts, thread summaries, reply generation, and search across your Workspace data, all from within Gmail.
Gemini also pulls context from Google Docs, Calendar, and Drive, so suggestions are grounded in your actual work rather than just the email in front of you.
There are two paths to Gemini in Gmail. If you’re on Google Workspace, Gemini features for drafting, summarizing, and proofreading come bundled in. If you’re an individual Gmail user, Google AI subscriptions unlock progressively more advanced features.
Gemini in Gmail helps users draft replies, summarize long threads, search their inbox using natural-language questions, and identify important information from messages.
Basic Gmail assistance and advanced Gemini features have different access requirements. Standard tools such as Smart Compose and Smart Reply are separate from Gemini capabilities like Help me write, thread summaries, inbox questions, and AI Overviews. Access to these advanced features depends on the user’s account type and eligible Google Workspace or Google AI plan. Availability may also vary by country, supported language, administrator settings, and feature rollout.
For Workspace subscribers, Gemini’s email features are bundled into the base plan at no extra cost. Individual Gmail users can access advanced features through Google AI subscriptions starting at $7.99/month, with higher tiers unlocking AI Inbox, AI Overviews search, and greater usage limits.
For teams already in Outlook, Teams, Word, and Microsoft 365, Copilot adds AI-powered drafting, summarizing, and meeting follow-ups without requiring anyone to adopt new tools.
Copilot drafts replies, summarizes email threads, prepares meeting follow-ups with action items, and pulls context from your calendar and documents through Microsoft Graph.
That means it sees your entire Microsoft 365 workspace, not just your inbox. The flip side is that its usefulness drops off sharply once you step outside the Microsoft ecosystem.
Copilot is an add-on to Microsoft 365 plans. The Business tier (Copilot Business) costs $21/user/month on an annual commitment, though promotional rates exist occasionally. The Enterprise tier (Microsoft 365 Copilot) runs $30/user/month with an annual commitment required. You also need a qualifying Microsoft 365 base subscription, so the true per-user cost is higher than the Copilot line item alone.
Ever tried to find an email from three months ago and couldn’t remember the right keywords? Shortwave’s natural language search lets you ask something like “What did Marcus say about the contract renewal in October?” and it finds the right thread.
That search capability is the headline feature of this AI-first email client, built for Gmail users who want a smarter inbox without adopting an enterprise tool.
Beyond search, Shortwave offers thread summaries, smart bundles that group newsletters and notifications together, and automatic task extraction from emails.
Shortwave has a free plan with basic features (branded signature on outgoing emails) and paid plans from $14-100/seat/month billed annually, depending on whether it’s an Individual or Business plan. The tiers are differentiated by AI model quality and usage limits rather than just features: higher plans get more powerful AI models, more AI usage, and deeper search history.
SaneBox takes a different approach from most tools on this list. Instead of writing emails for you or replacing your email client, it focuses on making sure you only see the emails that actually matter.
It analyzes your email history and behavior to learn which messages you prioritize and which ones you ignore. Low-priority emails get routed to a SaneLater folder, newsletters get grouped, and your main inbox stays focused on messages from real people.
It works behind the scenes with Gmail, Outlook, and most IMAP providers, so you keep using whatever client you already have.
One thing to know: despite the AI branding, SaneBox uses rule-based filtering with behavior learning rather than generative AI. It’s excellent at sorting, but it won’t draft replies or extract tasks.
Plans start at $4.99/month and go up to $24.99/month, depending on how many email accounts and features you need. The entry tier covers one account with basic filtering, while higher tiers add more accounts (up to four), additional features like SaneReminders and Do Not Disturb, and support for all SaneBox capabilities.
Spark is an email client with AI writing and smart inbox organization that works across multiple providers.
It supports Gmail, Outlook, Exchange, iCloud, and any IMAP-based provider, so you can manage all your accounts in one place.
Team collaboration tools like shared drafts, private comments, and task delegation make it useful for small teams coordinating on email.
If you only use Gmail and AI search is your priority, Shortwave is stronger in that area. But if you need multi-provider support, team collaboration, or a lower entry price, Spark covers more ground.
The free plan includes Smart Inbox, unlimited email accounts, and smart notifications. Paid plans start at $8.25/month per user. The Pro plan unlocks Spark +AI with compose, rephrase, translate, and 40 AI Meeting Notes per month. The Plus plan adds unlimited Meeting Notes, read statuses, HubSpot integration, and advanced team collaboration. The Enterprise tier is also available with a dedicated success manager and productivity coaching.
Lindy is an AI assistant platform that handles email triage, drafting, scheduling, and meeting notes. You describe what you want in plain language and Lindy creates an agent that handles it, learning your preferences and writing style over time.
It supports over 100 integrations and can chain actions across multiple tools. An incoming email can trigger scheduling, CRM updates, and follow-up messages in sequence.
The trade-off is cost. Plans start at $49.99/month with no permanent free tier, so Lindy is positioned as a premium productivity tool rather than a casual inbox helper.
Worth noting: Lindy is an AI agent platform that uses email as one of many channels, while Hostinger’s Agentic Mail is email infrastructure specifically built to connect mailboxes to agents and APIs.
They can complement each other well, with Agentic Mail providing the reliable email layer that tools like Lindy connect to.
Plans start at $49.99/month and go up to $199.99/month with no permanent free tier. The entry plan covers standard usage with up to 2 connected inboxes. Higher tiers increase usage limits (up to 7x), add more inboxes (up to 5), and unlock advanced features like Computer Use for browser-based task automation.
Fyxer connects to Gmail or Outlook and handles inbox triage, reply drafting, follow-up tracking, and meeting notes in one tool.
It works more like an executive assistant than a writing tool. Fyxer learns your writing style from past emails and suggests replies that actually sound like you. Fyxer drafts but never sends on your behalf, so you always have the final say.
It categorizes your inbox into groups like “to respond,” “notification,” and “FYI.” The meeting notetaker joins your calls, captures summaries and action items, and drafts follow-up emails to attendees.
If you’re deciding between Fyxer and Superhuman Mail, the question is whether meetings are part of your email problem. Superhuman Mail is purely about inbox speed and keyboard-driven efficiency. Fyxer ties email triage directly to meeting prep and follow-ups at a comparable price.
Plans start at $22.50/user/month for one inbox with triage, AI drafts, and the meeting notetaker, with lower rates on annual billing. The higher tier runs $37.50/user/month and adds multiple inboxes, Fyxer Chat for instant Q&A against your inbox and notes, HubSpot integration, and file uploads to train Fyxer on your context.
MailMaestro is an AI writing assistant that works directly inside Gmail or Outlook. It doesn’t replace your email client or reorganize your inbox. It just helps you write better emails, faster.
You describe what you want to say, choose a tone and length, and MailMaestro generates a polished draft in any of 18 supported languages. It also handles thread summaries, one-click replies, and saved writing preferences (called Magic Templates) that speed up future emails.
If you’re wondering why you’d use MailMaestro when Gemini or Copilot already offer writing help, the answer is specialization. Eighteen languages, personal data anonymization, and saved writing patterns are things the built-in tools don’t offer.
Paid plans cost $12-25/month per user for unlimited AI emails, thread and attachment summaries, and smart meeting scheduling.
When comparing AI email assistants, focus on your use case, email provider compatibility, automation depth, privacy, pricing, and whether the tool lets you review drafts before sending.
AI email assistants make the most sense when email starts consuming time that should go toward actual work. Here are the scenarios where they earn their keep:
The best AI email assistant depends on whether you need help writing messages, organizing your inbox, processing high email volumes, or automating complete workflows.
Writing assistants and smart inbox tools help users compose messages, prioritize conversations, and manage existing email more efficiently. Autonomous workflows require programmable email infrastructure that can connect a mailbox with AI agents, trigger external tools, and control automated communication.
Hostinger’s Agentic Mail provides this infrastructure through programmable mailboxes, webhooks, APIs, and agent integrations. Whichever tool you select, combining its automation features with a consistent system for organizing emails helps keep important conversations visible, reduce inbox clutter, and manage follow-ups more effectively.
Simon Lim
Simon is a dynamic Content Writer who loves helping people transform their creative ideas into thriving businesses. With extensive marketing experience, he constantly strives to connect the right message with the right audience. In his spare time, Simon enjoys long runs, nurturing his chilli plants, and hiking through forests. Follow him on LinkedIn.
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