Suppressions
The suppression list contains email addresses that should not receive emails. This includes bounced addresses and spam complaints.
Why Suppressions Matter
Sending to suppressed addresses harms your sender reputation:
- Bounces: Continued attempts to invalid addresses signals spam behavior
- Complaints: Ignoring spam reports can get your domain blacklisted
ToSend automatically manages your suppression list to protect your deliverability.
Viewing Suppressions
Go to Suppressions in your dashboard to see all suppressed addresses with:
- Email address
- Suppression reason (Bounced/Complained)
- Bounce type (if applicable)
- Date suppressed
Suppression Types
Bounced
Email addresses that returned a permanent delivery failure:
| Bounce Type | Description |
|---|---|
| General | Generic permanent failure |
| MailboxFull | Recipient's mailbox is full |
| ContentRejected | Email content was rejected |
| Suppressed | Previously bounced address |
Complained
Email addresses where the recipient clicked "Report Spam" or "Mark as Junk" in their email client.
Validation Suppressed
Addresses that failed email validation checks before sending.
Filtering Suppressions
By Status
- Bounced: Show only bounced addresses
- Complained: Show only spam complaints
By Bounce Type
Filter by specific bounce reason:
- General
- MailboxFull
- ContentRejected
- EmailValidationSuppressed
- OnAccountSuppressionList
By Domain
View suppressions for a specific sending domain.
By Search
Search for a specific email address.
Automatic Suppression
ToSend automatically adds addresses to your suppression list when:
- Hard bounce: Permanent delivery failure (invalid address, domain not found)
- Spam complaint: Recipient reports email as spam
- Validation failure: Address fails format validation
Sending to Suppressed Addresses
If you attempt to send to a suppressed address:
- The email will be blocked
- It will appear in your logs with status "Spam" or error message
- No email will be sent to protect your reputation
Best Practices
- Monitor bounce rates: High bounce rates (>4%) indicate list quality issues
- Clean your lists: Remove inactive subscribers regularly
- Use double opt-in: Confirm email addresses before adding to your list
- Honor unsubscribes: Remove unsubscribed users promptly