How to fix low sender health

title: How to fix low sender health
description: Recover your sender reputation when health drops below 85.

Overview

Sender health reflects how trustworthy email providers consider your mailbox. A healthy sender reputation keeps your emails landing in inboxes rather than spam folders. When health drops, you need to act quickly to protect your domain and recover your reputation.

Related: If you are unsure why your emails are landing in spam, see Why Are My Emails Going To Spam.

What to Do When Sender Health Drops Below 85

If your sender health falls below 85, take the following steps immediately:

• Stop sending cold emails from the affected sender right away. Continuing to send will only push the health lower and can cause permanent damage.
• Keep Email WarmUp enabled. WarmUp continues to rebuild trust with providers by generating positive engagement signals in the background.
• Wait for recovery. Do not resume sending until the health climbs back above 85 and stabilizes.

When to Replace Mailboxes

In most cases, patience and warm-up will restore your sender health. However, there is one exception:

• If your domain is burned — meaning it has been heavily blacklisted or flagged beyond recovery — you should remove all mailboxes tied to that domain and create new ones. You can verify your domain status by running a Domain Setup Report.

Will My Mailboxes Recover?

Yes. Your mailboxes will always recover, even if it takes a while. The key is to pause outbound activity, let warm-up do its work, and avoid rushing back into high-volume sending before the health score is fully restored.

Tip: Following Best Practices for Email Sender or Cold Email Mailbox will help you maintain strong sender health over the long term.

Frequently Asked Questions

How long does recovery take?

There is no fixed timeline. Recovery depends on multiple factors including your email service provider (ESP), how severely the health dropped, how long the sender was used before the drop, and the overall reputation of the IP address. Some senders recover within a few days; others may take several weeks.

Can I speed up recovery?

The best thing you can do is not touch the sender. Avoid reconnecting it repeatedly, changing settings, or running manual tests. Let WarmUp run quietly in the background. Constant activity can actually slow recovery because it creates additional signals for the ESP to evaluate.

Should I pause WarmUp too?

No. Keep WarmUp enabled at all times. WarmUp generates positive engagement signals (opens, clicks, replies, spam-to-inbox moves) that help rebuild your reputation. Pausing WarmUp removes the very activity that is helping you recover.

What if health drops below 70?

If your health drops below 70, take more aggressive action:

• Stop all cold emails immediately
• Keep WarmUp running
• Do not reconnect or test the sender for at least 1–2 weeks
• Run a Domain Setup Report to check for blacklist flags or DNS issues
• If health does not improve after 2 weeks of WarmUp only, consider replacing the mailbox

I am blacklisted. What should I do?

If your domain or IP is blacklisted, the best course of action is to abandon the burner domain and get a new one. Fixing a blacklist is almost impossible — blacklist operators rarely remove listings for cold email domains, and the process can take weeks or months with no guarantee of success.

• Verify your blacklist status by running a Domain Setup Report
• If blacklisted, purchase a new burner domain and set up fresh mailboxes
• Warm up the new senders before sending any cold emails

Updated on: 03/07/2026