Deliverability, Bounces, and Suppressions

Protecting your domain reputation is critical for ensuring your emails land in the inbox. Mailofly automatically monitors bounces and maintains a suppression list to shield your domain from spam penalties.

Hard Bounces vs. Soft Bounces

Bounce Type	Description	Mailofly Action
Hard Bounce	Permanent failure (e.g. email address does not exist, mailbox was deleted, or domain is invalid).	Immediately added to your organization’s Suppression List. Future attempts to send to this address are blocked automatically.
Soft Bounce	Temporary failure (e.g. recipient mailbox is full, server temporarily down, or message too large).	Retried according to exponential backoff rules over 48 hours. If permanently undeliverable, it is marked as failed.

Spam Complaints

When a user clicks “Report as Spam” or “Move to Junk” in Gmail, Yahoo, or Outlook, an automated Feedback Loop (FBL) notice is received by Mailofly:

The message status updates to complained.
An email.complained webhook event is emitted.
The recipient is automatically added to your suppression list to prevent future sends.

Managing Your Suppression List

You can view, search, and manage suppressed email addresses:

Open Audience → Suppressions in the dashboard.
Review the reason (Hard bounce, Spam complaint, or Manual unsubscribe).
If an address bounced due to a temporary DNS glitch or was resolved with the customer, click Remove Suppression to restore sending access.

Related topics

Introduction Scheduling and audience Delivery statuses Contacts

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