Overview
Domain health measures your sending reputation based on bounce rates and complaint rates. Migma monitors these metrics continuously and may suspend domains that exceed safe thresholds. View domain health at Settings → Sending Domains → [Your Domain] → Health.Health Status
| Status | Meaning | Action Required |
|---|---|---|
| Healthy | Metrics within safe limits | None - keep sending |
| Warning | Approaching thresholds | Review list quality |
| Critical | Thresholds exceeded | Immediate action needed |
| Suspended | Sending paused | Contact support |
Health Metrics
Bounce Rate
| Threshold | Status |
|---|---|
| < 5% | Healthy |
| 5-10% | Warning |
| > 10% | Critical → Suspension |
Complaint Rate
| Threshold | Status |
|---|---|
| < 0.1% | Healthy |
| 0.1-0.5% | Warning |
| > 0.5% | Critical → Suspension |
Thresholds only apply after 100+ emails are sent. Small volumes aren’t penalized for occasional bounces.
Health Dashboard
The health dashboard shows:| Metric | Description |
|---|---|
| Status | Current health status (Healthy/Warning/Critical) |
| Total Sent | Lifetime emails sent from this domain |
| Total Bounced | Lifetime bounced emails |
| Total Complaints | Lifetime spam complaints |
| Bounce Rate | Current percentage |
| Complaint Rate | Current percentage |
| Last Updated | When metrics were last calculated |
What Causes Poor Health?
High Bounce Rate
Common causes:- Old email lists - Addresses go stale over time
- Purchased lists - Often contain invalid addresses
- Typos - Users entering wrong email addresses
- Inactive domains - Company domains that no longer exist
High Complaint Rate
Common causes:- No permission - Sending to people who didn’t opt in
- Irrelevant content - Content doesn’t match expectations
- Too frequent - Sending too many emails
- Hard to unsubscribe - Users mark as spam instead
- Misleading subject lines - Content doesn’t match promise
Preventing Health Issues
Use double opt-in
Use double opt-in
Require new subscribers to confirm their email address:
- User enters email
- Confirmation email sent
- User clicks confirm link
- Only then added to list
Clean your list regularly
Clean your list regularly
Remove problematic addresses:
Migma automatically suppresses bounces and complaints.
| Remove | When |
|---|---|
| Hard bounces | Immediately |
| Soft bounces | After 3 consecutive failures |
| Unengaged | 6+ months without opens |
| Complaints | Immediately (automatic) |
Make unsubscribing easy
Make unsubscribing easy
Every email should have:
- Clear unsubscribe link
- One-click unsubscribe (no login required)
- Preference center option
Set expectations
Set expectations
When people subscribe, tell them:
- What content they’ll receive
- How often you’ll email
- How to manage preferences
Domain Suspension
When It Happens
A domain is suspended when:- Bounce rate exceeds 10%
- Complaint rate exceeds 0.5%
- Manual review identifies abuse
What Happens
When suspended:- All email sending from this domain is blocked
- Existing scheduled emails are paused
- You receive a notification
- Dashboard shows “Suspended” status
Reinstating a Domain
Identify the Issue
Review your metrics to understand what caused the suspension:
- Check bounce logs for patterns
- Review complaint sources
- Identify problematic list segments
Clean Your List
Remove all problematic addresses:
- Export your suppression list
- Cross-reference with your contact list
- Remove unengaged subscribers
- Verify remaining addresses
Contact Support
Reach out to Migma support with:
- Your domain name
- Steps you’ve taken to fix the issue
- Your plan to prevent recurrence
Monitoring Best Practices
| Frequency | Check |
|---|---|
| Daily | Review bounce notifications |
| Weekly | Check health dashboard |
| Monthly | Clean unengaged subscribers |
| Quarterly | Full list audit |
Health Recovery Tips
If your domain health is Warning or Critical:- Stop sending - Pause campaigns temporarily
- Review recent sends - Identify which campaign caused issues
- Clean aggressively - Remove anyone who hasn’t engaged in 3+ months
- Send to engaged only - Resume with your most active subscribers
- Ramp up slowly - Gradually increase volume