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Email List Hygiene and Segmentation Recommendations

Maintaining a clean, well-segmented email list is essential for deliverability, engagement, and compliance. This guide covers best practices for managing your email list health and using segmentation effectively to reach the right audiences.

Why List Hygiene Matters​

A healthy email list directly impacts:

  • Deliverability: ISPs favor senders with low bounce and complaint rates
  • Engagement: Clean lists improve open and click rates
  • Compliance: Meeting anti-spam regulations protects your sender reputation
  • Cost efficiency: Removing invalid addresses reduces wasted sends

Email Suppression Management​

The platform automatically manages email suppressions to protect your sender reputation and ensure compliance.

Types of Suppressions​

Emails can be suppressed for several reasons:

Hard Bounces

  • Permanent delivery failures (invalid email addresses, domain doesn't exist)
  • Automatically suppressed to prevent future delivery attempts
  • These addresses should be removed from your list permanently

Soft Bounces

  • Temporary delivery issues (mailbox full, server temporarily unavailable)
  • Automatically suppressed but may be retried after a period
  • Monitor these to identify patterns

Complaints (Spam Reports)

  • Recipients mark your email as spam
  • Automatically suppressed immediately
  • High complaint rates can damage your sender reputation

Unsubscribes

  • Recipients opt out via unsubscribe links
  • Automatically suppressed and removed from future sends
  • Required by anti-spam laws (CAN-SPAM, GDPR, etc.)

Manual Suppressions

  • Manually added addresses that should never receive emails
  • Useful for test accounts, internal addresses, or known invalid emails

Managing Suppressions​

You can view and manage suppressed emails in your workspace settings:

View Suppressions

  • Navigate to Settings → Email Suppressions
  • Filter by reason (bounce, complaint, unsubscribe, manual)
  • Search for specific email addresses
  • Export suppression lists for analysis

Remove Suppressions

  • Remove individual emails if they should be re-enabled
  • Use with caution—only remove if you're certain the issue is resolved
  • For hard bounces, removal is not recommended

Bulk Import Suppressions

  • Upload CSV files of emails to suppress
  • Useful for importing suppression lists from other platforms
  • All imported emails are marked as manually suppressed

Automatic Suppression Behavior​

The platform automatically:

  1. Filters suppressed emails before sending broadcasts, campaigns, or transactional emails
  2. Tracks suppression reasons to help you understand list health
  3. Prevents duplicate suppressions by normalizing email addresses
  4. Maintains suppression history for audit and compliance purposes

⚠️ Important: Suppressed emails are automatically excluded from all email sends. You cannot override this behavior to ensure compliance and protect your sender reputation.

Segmentation Best Practices​

Segmentation allows you to send targeted messages to specific groups of people, improving relevance and engagement.

Types of Segments​

Data-Driven Segments

  • Automatically update based on conditions
  • People enter or exit as they match criteria
  • Ideal for dynamic audiences that change over time

Manual Segments

  • Static lists of specific people
  • Updated only when you add or remove members
  • Useful for one-time campaigns or specific groups

Segmentation Strategies​

1. Engagement-Based Segmentation

Create segments based on email engagement:

  • Highly Engaged: People who opened or clicked in the last 30 days
  • At Risk: People who haven't engaged in 60-90 days
  • Inactive: People who haven't engaged in 90+ days

Example Conditions:

Segment: "Highly Engaged"
- Event: "email_opened" performed in last 30 days
- OR Event: "email_clicked" performed in last 30 days

2. Behavioral Segmentation

Segment by actions people take:

  • Product Purchasers: People who completed a purchase event
  • Cart Abandoners: People who added to cart but didn't purchase
  • Feature Users: People who performed specific feature-related events

Example Conditions:

Segment: "Cart Abandoners"
- Event: "added_to_cart" performed
- AND Event: "purchase_completed" not performed
- AND Attribute: "last_cart_date" exists

3. Demographic Segmentation

Target by profile attributes:

  • Location-Based: Segment by country, region, or city
  • Account Type: Free vs. paid users, plan tiers
  • Signup Date: New users, long-term users

Example Conditions:

Segment: "Premium Users"
- Attribute: "subscription_tier" equals "premium"
- OR Attribute: "account_type" equals "paid"

4. Lifecycle Segmentation

Group people by their journey stage:

  • New Users: Signed up in last 7 days
  • Active Users: Last active in last 30 days
  • Churned Users: No activity in last 90 days

Example Conditions:

Segment: "New Users"
- Attribute: "created_at" greater than 7 days ago
- AND Event: "user_activated" performed

Segment Match Types​

When creating segments with multiple conditions, choose your match type:

Match All (AND)

  • People must meet ALL conditions
  • More restrictive, smaller audience
  • Use for precise targeting

Match Any (OR)

  • People must meet ANY condition
  • Less restrictive, larger audience
  • Use for broader targeting

Segmentation Recommendations​

1. Start Broad, Then Narrow

Begin with larger segments and create more specific segments as you learn what works:

Broad: "All Users"
  ↓
Narrow: "Active Users"
  ↓
Narrower: "Active Users in US"
  ↓
Narrowest: "Active Premium Customers in US"

2. Use Nested Segments

Create segments that build on each other:

  • Base segment: "Email Subscribers"
  • Derived segment: "Email Subscribers - Engaged" (subset of base)
  • Derived segment: "Email Subscribers - At Risk" (subset of base)

3. Regular Segment Audits

Review and update segments regularly:

  • Monthly: Check segment sizes and member counts
  • Quarterly: Review segment performance and adjust conditions
  • Annually: Archive unused segments and consolidate similar ones

4. Segment Naming Conventions

Use clear, descriptive names:

✅ Good Names:

  • "Users - Premium - Active"
  • "Users - Signed Up Last 30 Days"
  • "Cart Abandoners - Last 7 Days"

❌ Poor Names:

  • "Segment 1"
  • "Test"
  • "Users"

5. Monitor Segment Health

Track key metrics:

  • Member Count: Size and growth trends
  • Engagement Rate: Opens, clicks, conversions
  • Churn Rate: People leaving the segment
  • Growth Rate: New people entering the segment

Combining Suppressions and Segmentation​

Best Practices​

1. Exclude Suppressed Emails in Segments

When creating segments for email campaigns, consider excluding suppressed emails:

Segment: "Active Users - Email Ready"
- Condition: "subscription_status" equals "active"
- AND Condition: NOT in segment "Suppressed Emails"

2. Create Re-engagement Segments

Target people who may need re-engagement before they become inactive:

Segment: "At Risk - Re-engagement Campaign"
- Event: "email_opened" not performed in last 60 days
- AND Attribute: "email" exists
- AND NOT suppressed

3. Segment by Suppression Reason

Analyze suppression patterns by creating segments based on suppression reasons (via attributes or manual tracking):

  • Identify common characteristics of bounced emails
  • Understand which segments have higher complaint rates
  • Adjust messaging for segments with higher unsubscribe rates

List Hygiene Checklist​

Follow this checklist to maintain a healthy email list:

Weekly

  • Review bounce rates and investigate spikes
  • Check complaint rates and adjust content if needed
  • Monitor unsubscribe rates by segment

Monthly

  • Review suppression list and remove resolved soft bounces (if appropriate)
  • Audit segment sizes and member counts
  • Clean up test and invalid email addresses
  • Review segment performance metrics

Quarterly

  • Conduct full list audit
  • Archive or remove inactive segments
  • Review and update segmentation strategy
  • Analyze suppression trends and patterns
  • Update segment conditions based on performance

Annually

  • Comprehensive list health review
  • Consolidate similar segments
  • Review and update documentation
  • Plan segmentation strategy for the year

Common Pitfalls to Avoid​

1. Ignoring Suppressions

  • ❌ Sending to suppressed emails damages reputation
  • ✅ Always respect suppression lists

2. Over-Segmentation

  • ❌ Creating too many tiny segments reduces efficiency
  • ✅ Focus on segments that drive meaningful results

3. Under-Segmentation

  • ❌ Sending the same message to everyone reduces relevance
  • ✅ Create segments that allow for personalized messaging

4. Stale Segments

  • ❌ Using outdated segments with incorrect conditions
  • ✅ Regularly review and update segment logic

5. Not Tracking Segment Performance

  • ❌ Creating segments without measuring their effectiveness
  • ✅ Monitor engagement and conversion metrics per segment

Measuring Success​

Track these metrics to measure your list hygiene and segmentation effectiveness:

List Health Metrics

  • Bounce rate (target: < 2%)
  • Complaint rate (target: < 0.1%)
  • Unsubscribe rate (varies by industry)
  • Suppression list growth rate

Segmentation Metrics

  • Segment size and growth
  • Engagement rate by segment
  • Conversion rate by segment
  • Segment overlap analysis

Overall Email Performance

  • Deliverability rate
  • Open rates by segment
  • Click rates by segment
  • Revenue per email by segment

🎉 That's it!

By following these practices, you'll maintain a healthy email list, improve deliverability, and send more relevant messages to your audience. Regular maintenance and strategic segmentation are key to long-term email marketing success.