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Mailboxes let your sequences send email steps, and bring email replies into the same Inbox as LinkedIn. You can connect as many as your plan allows.
Only Owners and Managers can connect mailboxes.

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Before you start

  • Only connect an inbox whose owner has agreed. If it’s someone else’s, use Copy sign-in link (below) so they sign in themselves. You never handle their password.
  • Sending cold email from a brand-new or personal address can hurt its reputation. Start low and build up. See Mailbox limits.
  • Every email step needs an unsubscribe link.

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Supported mailboxes

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How to connect

  1. Go to Senders → Connect sender.
  2. Under What would you like to connect?, choose Gmail, Outlook or Other email, tick the permission box, then click Continue.
  3. Fill in the account details:
    • Client (optional)
    • Display name, for example jane@acme.com
    • Owner email
    • Timezone
  4. Click Connect Gmail (or Connect Outlook / Connect Other email) and sign in on the secure page. If someone else owns the inbox, click Copy sign-in link and send it to them instead. The link expires after 15 minutes.
The mailbox shows Connecting until sign-in is complete, then Connected. Its emails and inbox history follow within a few minutes.
The sign-in link expires after 15 minutes. If it expires, go back and create a new one.

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What you’ll see on the sender

  • Senders list: for a mailbox, today’s Emails (used / cap). The Email chip filters the list to mailboxes.
  • Overview tab: the connection, health and warm-up level, and Why isn’t this sending?
  • Budgets tab: today’s emails against the cap, and the warm-up caps. You can set a lower manual cap.
  • Schedule tab: the mailbox’s own working hours.
  • Settings tab: a Mailbox card with Belongs to, BCC to CRM, Signature, and the tracking options.
  • Profile and Session tabs don’t appear. They are for LinkedIn senders only.

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Reconnecting

If the provider ends the session, the sender shows Re-login needed and its emails are held. Open the sender, go to the Overview tab and click Send re-login link (valid for 1 hour) or Sign in now if you’re the owner. It’s also emailed to the owner. See Sender Statuses and Errors. Common causes: the password was changed, the owner revoked access in their Google or Microsoft account, or the mail server rejected the login.

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Mailbox limits

Mailboxes start at warm-up level 3, which allows 80 emails a day. They can reach 120 a day at level 5. The platform maximum is 150 emails a day per mailbox. Like LinkedIn senders, mailboxes only send during their working hours. For cold email, Google recommends staying well under its official limits: about 50–100 a day from a personal Gmail and 100–150 from Google Workspace. For a personal Gmail or a brand-new mailbox, set a lower manual cap on the Budgets tab and raise it over a few weeks. See Channel Limits & Restrictions for Gmail, Outlook and other providers.

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Mailbox settings

Each mailbox has its own settings on its sender page: See Unsubscribe links, signatures and email tracking for all of these in detail.

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Using a mailbox in a sequence

  1. Add the mailbox to the sequence’s Pool, or pick it directly in the Send email step’s Mailbox setting.
  2. Add a Send email step and connect its three outcomes: next, bounced and no email.
  3. Put {{unsubscribe_link}} in the body. The pre-launch check warns you if it’s missing.
A sequence with a Send email step can’t be activated until a mailbox is available. A pool of mailboxes splits the volume evenly, and a contact emailed before always gets the same one again. See Sequence Nodes for all the email step settings, including threading and open/click tracking.

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Troubleshooting

1. “Hosted login did not complete”
  • The sign-in was cancelled or the link expired.
✅ Solution: Open the sender and generate a fresh link. If you’re not a Manager, ask one to send it. 2. The mailbox is stuck on Connecting
  • The sign-in wasn’t finished. For Other email, the server details may be wrong.
✅ Solution: Generate a new link and sign in within 15 minutes. For Other email, check the incoming and outgoing servers, ports and login with your email provider. Providers that use two-step verification often need an app password instead of the normal one. 3. Emails aren’t going out
  • The sender is out of its daily cap or outside its working hours.
  • The sequence has no mailbox in its pool.
  • The mailbox needs to sign in again.
✅ Solution: Open the sender and click Why isn’t this sending? on the Overview tab. It gives the exact reason in plain words. 4. “Trial workspaces can connect up to 3 senders”
  • Trials are limited to 3 active senders.
✅ Solution: Add billing under Settings → Billing to connect more. See Pricing Plans.

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Q: Does the Chrome extension work with mailboxes?

No, it isn’t needed. Mailboxes stay connected through the access you granted when signing in.

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Q: What happens when someone unsubscribes?

One click on the {{unsubscribe_link}} (no login, no form) excludes them from all future outreach across the whole workspace, on every channel, and ends their live enrollments. Their lead shows an Unsubscribed badge, and the lead, timeline and conversation are all kept.