Your mailbox
Gmail
Send from your Gmail account, create mailbox drafts, and bring outreach replies back into Reach-book.com.
Connect your Google account and choose which teammates can read or send.
Integrations
Send from your mailbox.
Sync your CRM.
Send outreach through Gmail or Microsoft 365, sync contacts with HubSpot, and track meetings booked through Calendly.
Explore all 8 connectionsAlso connect through SMTP, your customer API, ChatGPT and Claude, workspace API tokens, and webhooks.
ChatGPT and Claude
Find contacts without leaving your chat.
Ask ChatGPT or Claude for a company’s CEO or founder, or a named person. You approve the credit cost, get their verified work email, and save them as a prospect.
- Add the connectorIn Claude: Settings → Connectors → Add custom connector. In ChatGPT: add the Reach-book.com app.
https://reach-book.com/mcp/reachbook - Sign in and pick a workspaceChoose whether the assistant may also save contacts as prospects.
- Ask, then approveEach lookup shows its credit cost and waits for your approval in the browser. It can’t send email or read your inbox.
Your mailbox
Microsoft 365
Use your Outlook or Microsoft 365 mailbox for sending, drafts, and outreach conversation sync.
Reply from the same mailbox that sent the first email.
Sending
SMTP
Connect any other email provider with its SMTP settings, and add IMAP so replies come back into Reach-book.com.
With IMAP, replies and bounces stop follow-ups. Mailbox drafts need Gmail or Microsoft 365.
Your CRM
HubSpot
Keep prospect contact details in sync with HubSpot so your team can work from the same information.
Review the proposed changes before applying a contact sync.
Meetings
Calendly
Add a Calendly link to your emails so prospects can book a meeting, then track those bookings against your outreach.
See booked meetings alongside the prospect and conversation.
Your existing relationships
Customer database
Check your customer database before reaching out so existing customers do not receive a cold introduction.
Connect through your customer API and configure how records are matched.
Your own tools
Workspace API
Search for leads, look up verified emails, add prospects and record sales outcomes from your own code.
Each token has its own permissions and expiry date. Full reference in the developer docs.
Your workflows
Webhooks
Get a signed message in your own app, Zapier or Make when a prospect replies, a meeting is booked or a deal is won.
Failed deliveries are retried, and you can inspect the delivery history.
Choose the right connection
Choose a mailbox for your outreach.
| What you can do | Gmail | Microsoft 365 | SMTP + IMAP |
|---|---|---|---|
| Send email | |||
| Create mailbox drafts | |||
| Sync outreach replies | |||
| Automated follow-up campaigns |
Without IMAP, an SMTP mailbox only sends. Provider subscriptions and domains are separate. Availability depends on workspace settings, mailbox permissions, and your service allowances.
Before you decide
Which mailboxes can I connect?
Gmail and Microsoft 365 support sending, mailbox drafts, and outreach reply sync. Any other provider connects over SMTP, and with IMAP added it also syncs replies and runs follow-up campaigns. Mailbox drafts need Gmail or Microsoft 365.
Does Reach-book.com send email from its own servers?
No. Outreach goes out from your connected Gmail, Microsoft 365, or SMTP mailbox, and prospects reply to that mailbox. Replies sync back into the shared inbox from Gmail, Microsoft 365, and SMTP mailboxes with IMAP.
How does the HubSpot sync work?
Reach-book.com shows the proposed contact changes first. A workspace admin reviews the differences and applies the sync; nothing changes in HubSpot until then.
What does the Calendly integration record?
Add your Calendly link to an email. When a prospect books, the meeting is recorded next to the prospect and the conversation that led to it.
Can I use Reach-book.com from ChatGPT or Claude?
Yes. Add the Reach-book.com MCP server as a connector in ChatGPT, Claude or Claude Code, sign in, and choose a workspace. You can then ask for contacts at a company. Every paid lookup shows its credit cost and waits for your approval in the browser, and saving contacts is a separate permission you choose when connecting.
Can I connect my own tools?
Yes. Workspace API tokens carry permissions and an expiry date, and signed webhooks notify your systems about supported outreach and sales events. You can also connect your customer database to check existing relationships before outreach.
More answers in the help center.