To evaluate an AI email assistant, check four things in order: whether it covers the channels your requests actually arrive in, whether it asks before sending, what permissions and data policies it has, and how its pricing counts usage. Then run a one-week trial on your real inbox and measure how many of its drafts you'd send with light edits. Demos on sample data don't predict that number.
Start with where your requests come from
Before comparing features, spend one day tallying where requests reach you. Count every message that asks you to do something: send a file, answer a question, find a time, approve a thing. Note the channel.
If 90% land in one Gmail account, a tool that lives inside Gmail may be all you need. If a third come through Slack, WhatsApp, or Teams, an email-only assistant will leave that third on you. This one tally rules out more tools than any feature list.
The AI email assistant checklist
| Area | What to check | How to check it | Red flag |
|---|---|---|---|
| Channels | Which inboxes and chat apps it reads, and which are only "coming soon" | Integrations page and the in-app connect screen | Key channel listed without a launch status |
| What it actually does | Triage, summaries, drafts, scheduling, file lookup, task creation, follow-up tracking | Try each on a real message during the trial | Features shown only in video |
| Approval before sending | Whether drafts wait for you, and whether auto-send exists | Docs, then test: reply to yourself from another account | Auto-send on by default |
| Permissions | The exact OAuth scopes or Microsoft Graph permissions | Read the consent screen and privacy policy | Delete or settings access it doesn't explain |
| Google verification | No "unverified app" warning for a public product | Connect a Gmail account and watch the screens | Warning screen on a paid product |
| Data use and training | Limited Use statement, no training on your data, model providers named | Privacy policy | "May use data to improve services" with no carve-out |
| Retention and deletion | What's stored, and a deletion window after you leave | Privacy policy or ask support | No timeline |
| Context sources | Whether it searches files and calendar, not only the thread | Ask it to reply to a message that needs an attachment | Drafts that say "I've attached it" with nothing attached |
| Admin and team controls | SSO, admin consent, per-user management | Pricing page, enterprise page, security review | None for a tool sold to teams |
| Pricing unit | Per seat, per action, per message, or usage caps | Pricing page, including the fine print on limits | Limits not stated |
| Platforms | Web, desktop, iOS, Android | Download pages | Mobile you rely on listed as planned |
| Exit | Disconnecting, revoking tokens, deleting data | Try it at the end of the trial | No self-serve disconnect |
Security questions get a deeper treatment in Is it safe to give AI access to your email. Use that page for the vendor conversation and this one for the product decision.
How to run a one-week trial on your real inbox
- 1Day 1: connect the channels from your tally
Connect only what the tool supports and note what it can't reach. Read each permission screen as you go.
- 2Days 1 to 5: grade every draft
For each AI draft, mark it send as-is, light edit, heavy edit, or wrong. Keep the tally in a note. The share of send-as-is plus light edit is the number that matters.
- 3Day 3: test the hard cases on purpose
Forward it a thread that needs a file, a scheduling request across time zones, and a message with two separate asks. Watch whether both asks get answered.
- 4Day 4: check what it didn't do
Scroll back through the week. Look for requests it missed, follow-ups it never raised, and messages it treated as done that weren't.
- 5Day 5: count usage against the plan
Compare the week's volume with the pricing unit. A cap of so many actions a week feels generous until a launch week.
- 6End of trial: disconnect and confirm
Disconnect in the app, then check myaccount.google.com/permissions or your Microsoft account to confirm the access is gone.
Matching the tool type to how you work
| If your situation is | Look for | Can skip |
|---|---|---|
| One inbox, mostly reading and sorting | Built-in client AI or a filtering tool | Multi-channel coverage |
| High reply volume in one inbox | Draft quality in your voice, keyboard speed | Messaging integrations |
| Requests across email and chat | Coverage for every channel in your tally, one queue for approvals | Deep single-client customization |
| A team with compliance review | Admin controls, SSO, security review, a contract | Consumer-only tools |
| Work that needs files and calendar | Search across Drive or OneDrive and real calendar availability | Tools that only rewrite text |
For a side-by-side of specific products, see best AI email assistants and the comparison pages. This guide doesn't rank tools on purpose. The right answer depends on your tally.
Running Synced through the same checklist
If you trial Synced, the AI inbox assistant, here's how it maps to the list so you know what to test. Inboxes: Gmail, Outlook, Slack, Microsoft Teams, WhatsApp Business, Instagram Business, Messenger, SMS via Twilio, and GroupMe, plus Google Drive, OneDrive, and Google Calendar for context. Every AI-drafted message waits in Decide for approval. Scopes and data practices are listed in the privacy policy.
Pricing counts Action Plans: one message is one plan, however many steps it takes. Free covers 20 a week, Pro covers 100. Where it may not fit: Synced is in private beta with a waitlist, Android is planned with no date, iMessage is coming soon, and there's no Zoom connector. If any of those is in your tally, weigh it.
- Microsoft Graph permissions reference (Microsoft Learn) (checked 2026-09-13)
- Unverified apps (Google Cloud Help) (checked 2026-09-13)
- Google API Services User Data Policy (checked 2026-09-13)
- Configure how users consent to applications (Microsoft Learn) (checked 2026-09-13)
- OWASP LLM01:2025 Prompt Injection (checked 2026-09-13)