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Use Analytics to investigate delivery events and Suppressions to review addresses excluded from future sending. A suppressed recipient can produce a dropped message even when your application submits a new send request.

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Understand delivery failures

A hard bounce is a permanent delivery failure, such as a nonexistent address. Remove invalid addresses from your active list. A soft bounce is a temporary failure, such as a full mailbox or an unavailable receiving server. Review the reason and retry history before treating it as permanent. A spam complaint records a recipient’s report of unwanted mail when that report is available to turboSMTP. An unsubscribe records an opt-out. Keep your own contact database synchronized with these events.

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View and manage suppressions

Open Suppressions in your dashboard. The Type column identifies the source: Review the recipient, date, and reason when investigating an entry. Use Import suppressions to add addresses and Export to download suppression data. Removing an entry allows another delivery attempt. Only remove it after resolving the original issue and confirming the recipient should receive your messages. See the official dropped-email explanation. Open Settings → Email elements → Unsubscribe link to configure the available unsubscribe element. The same tab contains Footers and Templates. Review opt-outs in Suppressions and honor them in your application before sending again. See email settings for related controls. Consult the terms and conditions for service requirements.

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Choose where bounce notifications go

Open Settings → Notifications → Bounces Management. The card explains:
Enabling Bounce Notifications sends notifications about your bounced emails to us. To receive all your bounce notifications yourself, disable this option.
This setting controls the destination of bounce notifications. Manage suppressed addresses separately under Suppressions. See the bounce notification instructions.

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Export through the API

Use GET /suppressions/csv with a date range in YYYY-MM-DD format and a key with Statistics & Management APIs enabled:
Terminal
Set the environment variables locally and choose your date range. For filters, imports, and removals, see the suppressions API reference.