Understanding why emails are bounce stopped

What does it mean when my emails are bounce stopped?

Unify will mark emails as bounce stopped to maintain your mailbox health and optimize email deliverability. When you launch a new sequence, Unify automatically evaluates the email addresses enrolled in that sequence. This is done through a series of checks against email validation providers to ensure that the emails you’re about to send to are valid and active.

If these providers determine an email address is invalid, Unify “bounce stops” that email, preventing it from being sent. This immediately completes the sequence execution for that contact, protecting your mailbox from potential spam flags and ensuring better sender reputation.

Understanding the difference between Bounced and Bounce Stopped:

• Bounce Stopped: Unify prevents the email from being sent because our verification providers flagged the address as invalid or high-risk before any send attempt. This is a proactive protection measure.

• Bounced: The email was actually sent, and the recipient's mail server returned it (e.g., invalid address, mailbox full, domain issue). This is a real delivery failure that occurs after sending.

Note: Both bounced and bounce stopped contacts are automatically removed from the sequence—no manual action is needed from you. The key difference is timing: bounce stopped prevents sending, while bounced occurs after a send attempt.

Why does my bounce stopped rate look high?

You may notice an initial spike in your bounce stopped rate when launching a new sequence. This metric may appear higher than normal at beginning of your email campaign. It is expected to have a high bounce stopped rate initially, here’s why:

• Validation happens upfront: Unify checks all sequence enrollments as soon as the sequence starts. Any invalid email addresses are bounce stopped at this point, leading to a higher bounce stopped rate at the beginning.

• Rate normalizes over time: The bounce stopped rate is calculated as:

Bounce Stopped Rate = (Bounce Stopped Emails / Total Finished Enrollments)

At the start, the denominator (total finished enrollments) is low, which can make the bounce stopped rate appear high. We define enrollments are finished when those contacts have replied, opted out, finished all steps in the sequence, or have been marked as having bounced or bounced stopped. However, as more enrollments process and complete, this rate will level out and become more representative of your overall sequence performance.

How does Bounce Stopped protect my email campaigns?

Bounce stopping is an essential feature to maintain the success and health of your email campaigns:

1. Protects your sender reputation: Sending emails to invalid addresses can lead to high bounce rates, which email providers might interpret as spam activity. Bounce stopping prevents this.

2. Saves mailbox resources: By avoiding sending to invalid emails, bounce stopping ensures that your limited daily sends are reserved for valid, active contacts.

3. Optimizes deliverability: Cleaner email lists and valid recipients mean your messages are more likely to land in inboxes, not spam folders.

4. Identifies domain-level risks: Our verification providers may flag entire domains (like specific company email domains) as invalid or high-risk due to strict security settings or anti-spam configurations, protecting you from sending to addresses unlikely to receive your emails.

What should I do if I see a high Bounce Stopped rate? How can I decrease the rate at all?

If you notice a spike in your bounce stopped rate after launching a new sequence, here’s how to handle it:

• Review and segment your email lists: f you notice a rise in the bounce stopped rate over time and these emails were prospected by Unify, please reach out to us so we can investigate further. If the bounce stopped emails are from your CRM or contact uploads, this might indicate an outdated or low-quality list. In that case, consider improving your data hygiene by validating and cleaning your email lists before uploading them to Unify. You can segment your lists by source or quality, and test smaller batches to identify potential issues early.

• Understand domain-level patterns: If multiple contacts at the same company are all bounce stopped, this is normal behavior. Our verification providers may flag entire domains as high-risk due to strict security or anti-spam settings that make delivery unlikely.

• Export and analyze bounce stopped contacts: You can create an audience filtered by bounce stopped status to view and export these contacts to CSV. This allows you to analyze patterns in your bounce stopped emails and identify which sources or list segments have data quality issues.

• Monitor the rate over time: As the sequence progresses, the rate will stabilize. Focus on the overall performance of your sequence and the quality of your outreach.

Step‑By‑Step Guide: Export Bounce Stopped Contacts for Analysis

1. Go to Audience → Audience Builder.

2. Add filters such as:

   • Sequence status = “Bounced” or “Bounce Stopped”.

   • (Optional) Limit to the specific sequence(s) you want to analyze.

3. When filtering for multiple statuses, use “OR” logic rather than “AND” to ensure contacts appear in your results.

4. Export the audience as CSV to get the full bounced email list.

Why this matters: many users accidentally use “AND” logic, which returns empty lists because a contact cannot have multiple statuses simultaneously. Using “OR” captures all contacts with any of the selected bounce conditions.

Additional Troubleshooting for Bounce Stopped Emails

Advanced Troubleshooting for Persistent Bounce Stopped Issues

For users experiencing ongoing bounce stopped problems beyond the standard causes, here are advanced solutions:

Understanding Over-Qualification Issues

If you notice a consistently high bounce stopped rate with emails that appear to be valid, Unify's bounce stop protection may be over‑qualifying legitimate addresses. This can happen when the validation system is overly conservative in flagging potentially risky emails.

Contact support to review your specific case – they can spot‑check flagged emails and potentially lower the restrictions if the system is being too aggressive.

You can also review and adjust your bounce stopped ruleset settings by navigating to Settings > Features > Sequences > Rulesets, which allows you to customize how aggressively Unify validates email addresses before sending.

Advanced Prevention Strategies

Optimize Global Send Settings:

In your global send settings, consider disabling the “unverified emails” option to prevent sending to email addresses that haven’t been fully verified. While this may exclude some valid contacts (false negatives), disabling unverified emails generally improves overall deliverability and reduces bounce stopped rates.

Enable this setting only if you prefer to cast a wider net, understanding that it may increase your bounce stopped rate.

Prospecting Optimization:

When using the prospecting node, select the “freshest available” or “best match” option to find the cleanest, most up‑to‑date contact data and reduce bounce stopped rates.

Content Variation for Sequence Health:

Use snippets or spintax to create variation in your email content, which can help avoid spam filter triggers and reduce the likelihood of content‑related bounces.

If you notice bounces occurring later in longer sequences, consider reducing the number of steps in similar sequences to minimize exposure to rate limiting or content fatigue.

Manual Recovery for Important Prospects:

For important prospects who bounced due to temporary issues or correctable email address errors, you can manually re‑enroll them after addressing the underlying issue:

1. Update the email address in your CRM: Unify does not support in‑app email editing. To correct a bounced email address, update it directly in your CRM (e.g., Salesforce or HubSpot). Once updated, Unify will automatically sync the corrected email address.

2. Manually re‑add the contact to the sequence: After the corrected email syncs to Unify, you can manually re‑enroll the contact into the appropriate sequence.

3. Verify the bounce reason: Only re‑enroll contacts whose bounce was due to fixable issues (such as typos or temporary mailbox problems), not for permanently invalid addresses.

Check your email content for formatting issues: Special characters or formatting errors in your email copy (such as stray brackets like { or }) can cause emails to be blocked. Review your email templates and remove any unintended characters or formatting that might trigger spam filters.

Understanding opens alongside bounce status: If you notice that some contacts show email opens but are still marked as bounced or bounce stopped, this is typically due to automated security systems. Many organizations use security filters that automatically scan emails for safety, which gets logged as an "open" even though the recipient never actually saw the email. Additionally, delayed bounces can occur when a recipient's mail server initially accepts the email (allowing opens to be recorded) but later rejects it. In most cases, opens recorded alongside bounce status indicate automated security scans rather than genuine recipient engagement.