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AI email assistant comparison: 6 options for business email

By Julien CoulaudPublished October 31, 20265 min read

This Shipmail-authored comparison uses published documentation checked October 31, 2026. We did not create accounts, connect mailboxes, or run a common workflow. It therefore compares documented plans, host requirements and stated draft or confirmation boundaries. It does not rank quality, safety, privacy, delivery, search accuracy or support.

Julien Coulaud on X

Founder of Shipmail, the email platform for businesses and their AI agents. Every guide here draws on mail servers running in production.

  • AI assistant
  • Business email
  • Email productivity

Short answer

Choose an AI email assistant by where your mailbox lives and who controls the send step. Shipmail hosts business mail and includes a beta assistant. Superhuman, Shortwave and Fyxer add features to another mailbox. Outlook Copilot and Gmail Search AI Overviews depend on their suite, account and settings. This comparison reports vendor documentation checked October 31, 2026, not common-account test results.

Six options at a glance

OptionDocumented costMailbox and send boundaryConsider it when
Shipmail Assistant and MCPSources[1]Shipmail pricing[2]Shipmail Assistant documentation[4]Shipmail MCP permissions and security$4 Solo, $9 Pro, or $29 Team monthly per planHosts mail. Chat replies are drafts. Opt-in automations can send under a restricted policy. MCP Read and draft cannot send.You want hosted business mail and a draft-first assistant in one plan.
Superhuman MailSources[5]Superhuman Mail plans[6]Superhuman Mail Email AssistantStarter: $25/member/month, billed annually. Business: $33/member/month, billed annually.Uses an existing Gmail or Outlook inbox. Auto Drafts are Business drafts, not automatic sends.You keep Gmail or Outlook and want Superhuman's Business features.
ShortwaveSources[7]Shortwave pricing[8]Shortwave: use Outlook and other providers[9]Shortwave AI assistant guideBusiness is $30 per seat monthly.Requires Gmail or Google Workspace. Documentation describes draft writing; this review establishes no universal send-approval guarantee.You want a Gmail-centered email app with AI search and filters.
FyxerSources[10]Fyxer pricing[11]Fyxer permissions during setupPro: $37/person/month, billed annually.Connects Gmail or Outlook. It documents draft replies and manual review before sending.You want a Gmail or Outlook add-on with documented draft-first replies.
Microsoft Copilot in OutlookSources[13]Microsoft Copilot release notes[14]Microsoft Copilot requirementsNo feature-specific price established here.Uses a supported Outlook host, licence, tenant and Exchange Online mailbox. Copilot requests confirmation for the documented triage action on more than five emails or changes to inbox rules.Your organization already manages the required Microsoft environment.
Gmail Search AI OverviewsSources[16]Google Gmail Search AI Overviews update[17]Google Help: Get an AI Overview in Gmail searchNo Google Workspace price is stated here.A Gmail search feature. Availability depends on account type, language, settings and rollout.You need documented Gmail search assistance and can check your eligible account.

Start with the mailbox and the send step

An AI email assistant can be a hosted mailbox feature, an add-on to an existing inbox, or a feature inside a work suite. These products solve different jobs. The price of an add-on does not replace the cost of the Gmail, Google Workspace, Outlook or Microsoft 365 mailbox it needs.

For each option, ask four questions. Where does the mailbox live? Which plan unlocks the feature? Does the product document a draft, confirmation or send boundary? Which account, licence, tenant or settings must exist first? A documented feature is not a result from your mailbox.

Shipmail: hosted business mail with an included beta assistant

Shipmail hosts the business mailbox. Its beta assistant is included in paid plans and the 14-day trial. Current public prices are $4 monthly for Solo with 2 mailboxes, $9 for Pro with 4, and $29 for Team with 12. MCP is included with the plan. Taxes are extra.Sources[1]Shipmail pricing[2]Shipmail Assistant documentation

Assistant chat creates reply drafts for a person to review, edit and send. Separately, automations can send under an opt-in restricted policy in existing authenticated conversations. New recipients, new threads and other policy failures save a Draft instead. Higher-impact chat changes show confirmation cards. These controls do not establish content trust or draft correctness.Sources[2]Shipmail Assistant documentation[3]Shipmail automations documentation

For an external agent, the MCP Read and draft profile can read mail and calendars and create drafts, but cannot send. A mailbox-password approval keeps that connection to the selected mailbox. A dedicated address alone does not restrict an account-approved OAuth connection. The approved resources and permission profile do. Neither makes email content safe.[4]

Superhuman: an add-on to Gmail or Outlook

Superhuman Mail works inside an existing Gmail or Outlook inbox, so its subscription adds to the mailbox subscription. Its current Mail plan lists Starter at $25 per member per month on annual billing. Business is $33 per member per month on annual billing.Sources[5]Superhuman Mail plans[6]Superhuman Mail Email Assistant

Auto Drafts are a Business feature, not a Starter feature. Superhuman's help documentation says Auto Drafts appear as ordinary Gmail or Outlook drafts. The user can review, edit, send or delete them, and they do not send automatically.Sources[5]Superhuman Mail plans[6]Superhuman Mail Email Assistant

Use the $25 figure only as the entry price. It is not evidence that Starter includes Auto Drafts. Check the plan and the connected mailbox before a purchase, because this page did not test an account or a region.[5]

Shortwave: a Gmail-centered AI email app

Shortwave Business is listed at $30 per seat per month. Its provider documentation requires Gmail or Google Workspace. Other providers need forwarding into Gmail. Microsoft 365 and Exchange are unsupported, so the host-mailbox cost remains separate.Sources[7]Shortwave pricing[8]Shortwave: use Outlook and other providers

Shortwave documents AI help to write and improve drafts, search mail, organize the inbox and use filters. The cited guide does not establish a universal rule that every AI-created message is draft-only or that any message sends autonomously. Check the workflow and its approval settings before use.Sources[9]Shortwave AI assistant guide[7]Shortwave pricing

Shortwave's pricing page directs 24/7 workflow automation to Tasklet, its sister product. Treat that as a separate product decision, rather than a promise about the approval state of Shortwave's email assistant.[7]

Fyxer: draft-first assistance on Gmail or Outlook

Fyxer connects Gmail and Outlook. Its current public pricing lists Pro at $37 per person per month on annual billing. One paid seat can connect both inboxes. The existing mailbox subscription is additional.[10]

Fyxer's support documentation says it creates draft replies and does not send email on the user's behalf. Its MCP draft_email action writes a draft. The user opens it in Outlook or Gmail, reviews or edits it, then sends it. Microsoft 365 connections can require administrator approval.Sources[11]Fyxer permissions during setup[12]Fyxer MCP documentation

That is a documented send boundary, not a safety or quality finding. Check the connected-account setup and the required permissions in the tenant you plan to use.[11]

Microsoft Copilot in Outlook: confirm the tenant conditions

Microsoft's Outlook release notes describe natural-language deletion, moves, copies, categories, rules and folders. The cited note says Copilot requests confirmation before it acts on more than five emails or makes changes to inbox rules. That confirmation statement applies to the described Outlook triage action only.[13]

Microsoft separately documents a qualifying prerequisite licence, a Copilot licence for licensed capabilities, an Entra work or school account, Exchange Online for mailbox-grounded experiences, and a supported Outlook host. App, licence and tenant configuration can affect availability. This page does not state a feature-specific price for Outlook triage.Sources[14]Microsoft Copilot requirements[15]Microsoft Copilot license options

Gmail Search AI Overviews: eligibility is part of the product

Google's September rollout announcement describes English-language access on eligible Workspace editions and consumer Google AI plans. Current Help also lists personal-account access through Google Workspace Experiments. Check Google's current language and account requirements before use. Both smart-feature settings must be on. Workspace availability also depends on the documented Gemini for Workspace in Gmail and Workspace Intelligence access settings.Sources[16]Google Gmail Search AI Overviews update[17]Google Help: Get an AI Overview in Gmail search

Google says the feature is gradually rolling out. Its EEA, UK, Switzerland and Japan exclusion is for personal accounts. Google does not state the same exclusion for Workspace accounts. Search operators such as from: and is:unread do not show an AI Overview.Sources[16]Google Gmail Search AI Overviews update[17]Google Help: Get an AI Overview in Gmail search

No eligible account was checked for this comparison. Do not turn Google's rollout or eligibility documentation into a claim about search quality, completeness or availability in your mailbox.[17]

AgentMail and Cloudflare are infrastructure, not human email assistants

AgentMail documents an agent-first email API, a hosted MCP server and Agent Search. Its announcement describes REST and MCP search for ranked messages or threads, says retrieved content is untrusted, and limits a relevance-search page to 100 results. These are API workflow facts, not a replacement for a human email assistant.Sources[18]AgentMail: Introducing Agent Search[19]AgentMail MCP documentation[20]AgentMail pricing

Cloudflare documents a beta programmatic Email Service for inbound routing and transactional sending through Workers, REST or SMTP. Arbitrary-recipient sending requires Workers Paid. Current public pricing states 3,000 included outbound emails per account each month, then $0.35 per 1,000. It is not a hosted business mailbox or shared human inbox.Sources[21]Cloudflare Email Service for agents[22]Cloudflare Email Service overview[23]Cloudflare Email Service pricing

If you are building agent mail workflows, read the API guide instead of using this comparison as an implementation decision.

A practical selection checklist

  1. Step 1

    Name the mailbox owner

    Choose a hosted mailbox when the team needs email. Choose an add-on only when you will keep the existing host.

  2. Step 2

    Name the paid feature gate

    Write down the exact plan, billing period and any seat, licence or tenant condition. Do not compare an entry price with a Business-only feature.

  3. Step 3

    Check the send boundary

    Confirm whether the documented workflow creates a draft, requires confirmation, or can send. Treat unknown behavior as unknown.

  4. Step 4

    Use a fictional corpus before real mail

    Run the same ordinary and near-match tasks. Record the account, settings, result, reviewer and failures.

  5. Step 5

    Keep incoming mail untrusted

    A permission allows an action. It does not authorize instructions found in a message or prove that an output is correct.

This checklist is a decision aid based on the documented products. It is not a safety, delivery, privacy or quality test.Sources[4]Shipmail MCP permissions and security[18]AgentMail: Introducing Agent Search

Sources23 sourcesVerified 2026-10-31
  1. [1]
    Shipmail pricing

    Shipmail plan prices, mailbox limits, team access, and send limits.

    shipmail.to · 2026-10-15

  2. [2]
    Shipmail Assistant documentation

    The AI assistant answers what needs a reply, finds conversations, files messages, sets up inbox rules for future mail and drafts replies. Its replies are normal drafts in the Drafts folder, Writing Style drafts from pasted examples, and organization admins can turn AI off for everyone.

    shipmail.to · 2026-10-15

  3. [3]
    Shipmail automations documentation

    Plain-language automations compiled by the AI assistant and confirmed before saving: triggers on new email, a schedule or manual runs, sandbox tests, Recent runs, and automatic sending off unless the organization enables it, limited to existing conversations. Deterministic sorting belongs to inbox rules that run on the mail server.

    shipmail.to · 2026-10-15

  4. [4]
    Shipmail MCP permissions and security

    How Shipmail limits an MCP connection: Read and draft, Mail assistant, Full access or Custom permissions, mailbox-password sign-in limited to one mailbox, and revoking under Developer, Connections.

    shipmail.to · 2026-10-01

  5. [5]
    Superhuman Mail plans

    Superhuman Mail plans checked 2026-10-31: Starter is $25 per member a month on annual billing. Business is $33 on annual billing. The plan lists Auto Drafts, Ask AI, MCP and Custom Auto Labels for Business. Use the Starter price only as an entry price, not as an Auto Drafts price.

    superhuman.com · 2026-10-31

  6. [6]
    Superhuman Mail Email Assistant

    Superhuman documents Email Assistant inside existing Gmail or Outlook inboxes. Its Auto Drafts are normal Gmail or Outlook drafts; a user can review, edit, send or delete them, and they do not send automatically.

    help.superhuman.com · 2026-10-31

  7. [7]
    Shortwave pricing

    Shortwave per seat a month: Business $30, Premier $45, Max $120, with a 14-day trial. Features include an AI assistant with a choice of Claude models, AI search over 5 years of email on Business, 3 AI filters on Business, splits, bundles, block and unsubscribe, delivery schedules, todos, read statuses, link tracking, snippets, follow-up reminders, calendar integration, AI integrations through MCP, thread sharing, team comments, assignees and shared labels. The page quotes customers who reached inbox zero with Shortwave. It directs 24/7 workflow automation to Tasklet, its sister product.

    shortwave.com · 2026-10-31

  8. [8]
    Shortwave: use Outlook and other providers

    Shortwave requires a Gmail or Google Workspace account to sign in. Microsoft 365 and Exchange accounts are not supported. Other providers work by forwarding mail into a Gmail account and sending through Gmail's Send mail as.

    shortwave.com · 2026-10-31

  9. [9]
    Shortwave AI assistant guide

    Shortwave documents AI assistance for inbox organization, writing and improving drafts, search, calendar actions, integrations and AI filters. It does not establish one approval state for every AI-created email.

    shortwave.com · 2026-10-31

  10. [10]
    Fyxer pricing

    Fyxer per person a month: Free $0; Pro $37 billed annually or $49 monthly; Team $64 billed annually or $99 monthly; Enterprise on an annual contract. Pro adds replies drafted in your tone, automatic inbox labeling, meeting recording and Flows. Team adds unlimited shared spaces, assigned follow-ups, shared company context and team reporting. Works with Gmail and Outlook. The trial is 14 days of the Team plan. The FAQ says Fyxer cannot send emails on your behalf; it drafts replies and you decide what gets sent. The page claims 100,000+ people use Fyxer. A paid seat can connect both Gmail and Outlook inboxes; the host mailbox subscription remains additional.

    fyxer.com · 2026-10-31

  11. [11]
    Fyxer permissions during setup

    Fyxer documents Google Workspace and Microsoft Graph connections, draft replies and that it does not send email on the user's behalf. Microsoft 365 connections can require administrator approval.

    support.fyxer.com · 2026-10-31

  12. [12]
    Fyxer MCP documentation

    Fyxer documents Gmail or Outlook inbox and calendar requirements for MCP. Its draft_email tool writes a draft for the user to open, review and send in the mail host.

    support.fyxer.com · 2026-10-31

  13. [13]
    Microsoft Copilot release notes

    Microsoft's Outlook release notes document natural-language deletion, moving, copying, categorization, rule management and folder creation. The specified Outlook triage action requests confirmation before acting on more than five emails or changing inbox rules.

    learn.microsoft.com · 2026-10-31

  14. [14]
    Microsoft Copilot requirements

    Microsoft documents qualifying prerequisite and Copilot licences, an Entra work or school account, Exchange Online for mailbox-grounded experiences and supported hosts. App, licence and tenant configuration can affect availability.

    learn.microsoft.com · 2026-10-31

  15. [15]
    Microsoft Copilot license options

    Microsoft lists eligible prerequisite plans and notes that terms can change. This source does not establish one feature-specific price for Outlook triage.

    learn.microsoft.com · 2026-10-31

  16. [16]
    Google Gmail Search AI Overviews update

    Google documents Gmail Search AI Overviews for eligible paid English-language accounts, including named Workspace editions and consumer Google AI plans. Both user smart-feature settings are required. Workspace configuration includes Gemini for Workspace in Gmail and Workspace Intelligence access to Gmail. Consumer regional exclusions do not state the same restriction for Workspace accounts.

    workspaceupdates.googleblog.com · 2026-10-31

  17. [17]
    Google Help: Get an AI Overview in Gmail search

    Google says Gmail Search AI Overviews are gradually rolling out and may not yet be available. It describes eligible paid plans and personal-account access through Google Workspace Experiments, smart-feature settings and that search operators such as from: and is:unread do not show an AI Overview.

    support.google.com · 2026-10-31

  18. [18]
    AgentMail: Introducing Agent Search

    AgentMail's July 22, 2026 announcement says its relevance-ranked message and thread search results are untrusted input and must not be treated as instructions.

    agentmail.to · 2026-10-24

  19. [19]
    AgentMail MCP documentation

    AgentMail documents a hosted MCP server at https://mcp.agentmail.to/mcp and an optional local stdio compatibility bridge. OAuth uses the console identity and API-key access uses x-api-key. The catalog includes inbox, message, thread, draft, attachment and AgentID tools, including the full-text relevance tools search_messages and search_threads.

    docs.agentmail.to · 2026-10-24

  20. [20]
    AgentMail pricing

    Monthly list prices: Free is $0 for 3 inboxes, 3,000 emails and 3 GB on agentmail.to. Developer is $20 for 10 inboxes, 10,000 emails, 10 GB, 10 custom domains and 2 organization seats. Startup is $200 for 150 inboxes, 150 custom domains and 10 seats, with no separate monthly email cap, a 15,000-email daily limit, a 1,500-email five-minute limit and unlimited storage. Developer and Startup add inboxes and domains for $2 each, 1,000 monthly sends for $2, and seats for $5 each. Each monthly-sends add-on also raises the daily and five-minute limits. Annual billing is 20% lower.

    agentmail.to · 2026-10-24

  21. [21]
    Cloudflare Email Service for agents

    Cloudflare's April 2026 public beta of Email Sending, paired with Email Routing and the Agents SDK onEmail hook for inbound mail. Sending needs Workers Paid: 3,000 emails a month included, then $0.35 per 1,000. No hosted mailboxes; Cloudflare's general MCP server covers the API.

    blog.cloudflare.com · 2026-10-12

  22. [22]
    Cloudflare Email Service overview

    Email Routing (Free and Paid plans) routes incoming mail to addresses or Workers. Email Sending is in beta for outbound transactional email on Workers Paid, through a Workers binding, the REST API or authenticated SMTP. No hosted mailboxes are described.

    developers.cloudflare.com · 2026-10-15

  23. [23]
    Cloudflare Email Service pricing

    Email Routing inbound is unlimited on Workers Free and Paid. Sending to verified destination addresses is free on all plans. Sending to any recipient needs Workers Paid: 3,000 emails a month included, then $0.35 per 1,000.

    developers.cloudflare.com · 2026-10-15

Questions worth answering

Common questions about AI email assistant comparison.

What is the best AI email assistant?
This comparison does not name a winner. Pick by mailbox host, feature gate and documented send boundary, then test the workflow you need.
Does an AI email assistant need Gmail or Outlook?
The compared add-ons do, but Shipmail hosts its own business mailboxes. Gmail Search AI Overviews and Outlook Copilot also depend on their own suite conditions.
Can an AI email assistant send email automatically?
The answer depends on the product and configuration. Shipmail assistant chat replies are drafts. Its automations can send under an opt-in restricted policy; policy failures save a Draft. MCP Read and draft cannot send. Superhuman and Fyxer document draft-first behavior. This comparison makes no universal claim for Shortwave, Outlook or Gmail.
Where can I compare email infrastructure for agents?
Read the email API for AI agents guide for AgentMail, Cloudflare and similar programmatic email services.

Related guides

More on Shipmail pricing, comparisons, and team workflows.

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