- 1
Connectors → open the mailbox
When a campaign stops sending from an account, open it from Connectors and look at the Details tab first.
- 2
Spot the expired-token alert
For Google or Microsoft mailboxes, a disconnected token shows an amber alert with the failure reason and a prominent Reconnect Account button.
- 3
Click Reconnect Account (OAuth)
For Google or Microsoft, click Reconnect Account, re-authorize in the popup, and the mailbox is live again — no password stored.
- 4
Or run Test Connection
If there's no alert but you suspect a problem, click Test Connection. Success shows “Connection verified!” An OAuth failure is turned into reconnect guidance automatically.
- 5
Check Verified / Last verified
These fields confirm the mailbox's current auth state and when it last passed a check — a stale Last verified date is a hint to re-test.
- 6
Fix credential (SMTP/IMAP) mailboxes
Credential mailboxes have Test Connection but no OAuth reconnect. If the test fails — for example after a rotated app password — delete the connector and re-add it with fresh credentials.
- 7
Re-check sending
After reconnecting, confirm the mailbox is still selected in your campaign's senders and that its daily limit and warm-up settings are intact.
Pro tips
Hard-won shortcuts that keep warm-up on track.
Check Connectors first when sends drop
A disconnected mailbox is the most common cause of a campaign that stopped sending. The Details tab tells you in one glance.
Reconnect keeps your settings
OAuth reconnect restores authorization without wiping the mailbox's daily limit, warm-up, or signature — you don't rebuild anything.
Rotated an app password? Re-test, then re-add
Credential mailboxes can't reconnect in place; a failed test after a password change means delete and re-add with the new one.
Watch for the alert proactively
The amber token alert appears the moment a test detects a lapse — don't wait for a customer to report silence.
Frequently asked questions
My campaign stopped sending from one mailbox — why?
Most often its authorization lapsed. Open the mailbox in Connectors — a Google/Microsoft token expiry shows a reconnect alert.
How do I reconnect a Google or Microsoft mailbox?
Click Reconnect Account on the Details tab and re-authorize in the popup.
Does reconnecting lose my settings?
No — daily limit, warm-up, and signature stay in place; only the authorization is refreshed.
What does Test Connection do?
It verifies the mailbox can send (and read, for IMAP); an OAuth failure is turned into reconnect guidance.
There's no Reconnect button on my SMTP/IMAP mailbox — why?
Reconnect is OAuth-only (Google/Microsoft). Credential mailboxes use Test Connection; if it fails, re-add the connector with fresh credentials.
How do I fix a mailbox after changing its app password?
Re-test it; if the test fails, delete the connector and add it again with the new password.
How do I know when a mailbox last worked?
The Last verified field shows when it last passed a connection check.
Will FirstSales alert me automatically?
The expired-token alert appears the moment a test detects a lapse; also watch the Alerts center for mailbox-down notices.
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