Email campaigns not sending / sending low volume even after errors are fixed

Overview:

When email campaigns fail to send or send fewer emails than expected—even after visible errors are fixed, it’s often due to misconfigurations in sender account settings or campaign timing rules. Common causes include sent time discrepancies, disconnected mailboxes, or the need to reassociate leads after mailbox changes. Ensuring correct sync between campaign trigger time and mailbox minimum time gap, along with verifying account connectivity, is crucial for restoring full campaign performance. Once these checks are completed, always update the campaign settings to reinitiate proper sending behavior.

Why Your Campaign Isn’t Sending Emails (Even After Fixes), Key Checks You Might Be Missing

When the campaigns are not sending any email even after resolving the errors, you need to check with these things:

1. Check Sender Accounts

Firstly, navigate to the Campaign>>Performance>>Sender Accounts to Check ~

2. Sent Time Discrepancy

If the campaign’s trigger time is equal to or less than the minimum time gap set for mailboxes, it causes conflicts.

This happens when, the Campaign Trigger is “equal OR lesser” than the “minimum time gap” of the mailboxes.

Fix: It is suggested to keep the Campaign Trigger always minimum 3 minutes more than the "‘minimum time gap’ of the mailbox causing sent time discrepancy.

For example:

An email will be sent every: 18 minutes

Minimum Time Gap: 18 minutes

Minimum Time Gap: 20 minutes

These will create sent time discrepancy within the campaign, resulting either skipping of triggers or sending more than set limit.

3. Disconnected

Check if the sender accounts associated to the campaign are being disconnected from the campaign.

If yes, kindly reconnect the mailbox, by click on the Re-connect button under the ‘Action’ tab.

Reassociate:

If the mailboxes were disconnected/removed from the campaign and then again re-added to the campaign, the leads are needed to be reassociated with the mailboxes again. Click on the “Reassociate” button under the ‘Action’ tab.

**Once, the above fixes are made, kindly click on Edit Campaign (pencil icon)>>Final Review>>Update Campaign.

Quick Checklist: Campaign Not Sending / Low Volume

Check Sender Accounts
→ Go to Campaign > Performance > Sender Accounts
Sent Time Discrepancy
- Is Campaign Trigger Time ≥ Minimum Time Gap + 3 mins?
- Adjust if not.
Disconnected Mailboxes
- Any mailbox showing “Disconnected”?
- → Click “Re-connect” under the Action tab.
Reassociate Leads
- Was a mailbox removed and re-added?
- → Click “Reassociate” under Action tab to sync leads again.
Update Campaign Settings
- Go to Edit Campaign > Final Review > Update Campaign
- Saves and applies all recent changes.

Frequently Asked Questions

Q1: Why are no emails being sent even though I fixed visible errors?
A: It's likely due to timing mismatches (trigger time vs. minimum gap), disconnected mailboxes, or leads not being reassociated after mailbox changes. Follow the checklist above.

Q2: What is the ideal gap between campaign trigger and mailbox time gap?
A: Always maintain a minimum 3-minute buffer between the campaign trigger time and the mailbox's minimum time gap to avoid conflicts.

Q3: Do I need to reassociate leads after reconnecting a mailbox?
A: Yes. If a mailbox is removed and re-added, leads must be reassociated using the "Reassociate" button to resume sending properly.

Q4: I made all changes, but emails are still not sending. What should I do?
A: After making any change, you must click “Update Campaign” from the Final Review tab. Without this, updates won't be applied.

Q5: Can I view why a mailbox is disconnected?
A: Go to Sender Accounts under Campaign > Performance. Hover or click on the status indicator for more information or reconnect as needed.

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