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Hard Bounce Auto-Shield & Suppression

Sending to dead or non-existent email addresses harms your sender domain reputation. MailFuz Pro features an automated Bounce Auto-Shield.

Detection & Quarantine

Section titled “Detection & Quarantine”
  • Hard Bounces: When a transport provider returns an SMTP status code 550, 554, or error message indicating mailbox unavailable or user unknown, MailFuz immediately marks the subscriber record with is_suppressed = 1.
  • Soft Bounces: If a recipient experiences 3 consecutive temporary delivery failures (e.g. mailbox full, server unavailable), they are shifted to suppression.

Zero-Waste Dispatches

Section titled “Zero-Waste Dispatches”

Once a contact is marked is_suppressed = 1:

  • Future broadcast blasts and automated drip journeys automatically skip the recipient.
  • Delivery logs record: Skipped: Recipient suppressed due to previous hard bounce.
  • Prevents spending API credits on bad contacts.

Unsuppressing Contacts

Section titled “Unsuppressing Contacts”

If an administrator confirms that a suppressed recipient address has been corrected:

  1. Navigate to MailFuz → Audience & Contacts.
  2. Locate the contact row bearing the red SUPPRESSED badge.
  3. Click the shield Unsuppress icon button.
  4. The quarantine flag is cleared, restoring delivery eligibility.