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Overview

The suppression list contains email addresses that should not receive emails from your account. Migma automatically blocks sending to these addresses to protect your domain reputation. View your suppression list at Settings → Sending Domains → Suppression List.

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How It Works

When you try to send to a suppressed email:
  1. Email is blocked before sending
  2. No delivery attempt is made
  3. The send is logged as “suppressed”
  4. Your sending quota is not affected
This prevents damage to your sender reputation from repeated bounces or complaints.

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Suppression Reasons

ReasonDescriptionHow Added
bounceEmail previously bounced (permanent)Automatic
complaintRecipient marked email as spamAutomatic
unsubscribeRecipient unsubscribedAutomatic
manualAdded by youManual

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Automatic Suppression

Migma automatically adds addresses when:

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Permanent Bounces

When an email permanently bounces:
  • Invalid email address
  • Domain doesn’t exist
  • Mailbox not found
Added immediately after the first permanent bounce.

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Spam Complaints

When a recipient marks your email as spam:
  • Through their email client (Gmail, Outlook, etc.)
  • Via ISP feedback loop
Added immediately upon receiving the complaint.

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Unsubscribes

When a recipient unsubscribes:
  • Via unsubscribe link in email
  • Through preference center
  • Via List-Unsubscribe header
Added immediately upon unsubscribe.

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Viewing the List

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List View

The suppression list shows:
ColumnDescription
EmailThe suppressed email address
ReasonWhy they were suppressed
SourceHow they were added (automatic/manual)
DomainWhich domain triggered suppression
DateWhen they were suppressed

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Filtering

Filter the list by:
  • Reason: bounce, complaint, unsubscribe, manual
  • Date range: When added
  • Search: Email address

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Managing Suppressions

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Adding Addresses Manually

Add addresses you know shouldn’t receive email:
1

Go to Suppression List

Navigate to Settings → Sending Domains → Suppression List
2

Click Add

Click Add to Suppression List
3

Enter Email

Enter the email address to suppress
4

Save

Click Add to confirm

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Bulk Import

Import multiple addresses at once:
  1. Click Import
  2. Upload a CSV file with email addresses
  3. Review the preview
  4. Confirm import
CSV Format: 
email
[email protected]
[email protected]
[email protected]

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Removing Addresses

Be careful when removing addresses. If they were added due to a bounce or complaint, sending to them again will likely hurt your reputation.
To remove an address:
  1. Find the address in the list
  2. Click the remove icon
  3. Confirm removal
When it’s safe to remove:
  • Manual additions that are no longer needed
  • Addresses that were mistakenly added
  • Re-engagement campaigns (with explicit permission)

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Suppression and Sending

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What Happens When You Send

When sending to a list that includes suppressed addresses:
ResultCount
SentEmails delivered to non-suppressed addresses
SuppressedEmails blocked (suppressed addresses)
You’ll see both counts in your send report.

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Partial Sends

If you send to 1,000 recipients and 50 are suppressed:
  • 950 emails are sent
  • 50 are suppressed (not sent, not billed)
  • Your report shows both numbers

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Best Practices

Addresses added automatically (bounces, complaints) should stay suppressed:
  • Bounces will bounce again, hurting your rate
  • Complaints may complain again, worse for reputation
  • Unsubscribes requested not to receive email
Only remove if you have explicit new permission from the person.
Before major sends:
  1. Export your suppression list
  2. Cross-reference with your send list
  3. Ensure your list is clean
This prevents surprises in your send reports.
Proactively suppress:
  • Role addresses (admin@, info@, support@)
  • Known spam traps
  • Previous hard bounces from other systems
  • Competitors’ addresses
This protects your reputation before issues occur.

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Exporting the List

Export your suppression list for backup or analysis:
  1. Go to Suppression List
  2. Apply any filters (optional)
  3. Click Export
  4. Download CSV file
Exported data includes:
  • Email address
  • Reason
  • Source
  • Date added
  • Domain (if applicable)

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Data Retention

Suppression list entries are permanent by default:
  • No automatic expiration
  • Manual removal required
  • Protects against re-adding problematic addresses

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Next Steps

Domain Health

Monitor reputation metrics

Send to Audience

Send emails safely