An email suppression list records addresses that a sender should stop emailing. Before attempting a delivery, the sending system checks whether the recipient has an active suppression. An address may be suppressed because a previous email bounced, the recipient reported spam, they opted out, or someone added a manual restriction.
For a product team investigating a missing password reset or an excluded campaign recipient, the useful question is: what restriction applies to this address, and why? Removing a record before answering that can restart unwanted mail or repeat the delivery failure that created it.
What does suppressed mean?
A suppressed email is withheld because a sending rule excludes its recipient. That differs from an email that was delivered to a mail server and placed in a spam folder. It also differs from the original bounce, which reports a failed delivery attempt. A bounce can create a suppression that prevents later attempts.
Suppression preserves a decision across sends. Without it, the next campaign import or automated notification could try the same address again, even though the sender already knows the address failed or the recipient objected.
A suppression record is useful history. Deleting a contact from a campaign audience does not preserve the same protection: a later import might add the contact back. Keep your audience selection and your reasons for excluding an address separate.
Why an address ends up on a suppression list
| Reason | What it tells you |
|---|---|
| Bounce | A delivery attempt failed. Read the failure detail and expiry. |
| Complaint | A spam complaint was reported. Review the recipient's expectations. |
| Unsubscribe | The recipient opted out. Identify the scope of their choice. |
| Manual | Your workspace excluded the address. Find the original reason. |
Complaint reporting is incomplete: an empty complaint history does not prove that nobody marked your email as spam. Do not use the absence of a block as evidence that a recipient wants more mail.
Samva records bounce and complaint suppressions from delivery feedback. Its suppression records distinguish bounce, complaint, unsubscribe, and manual, and include an active state and an optional expiry. An expired record can remain visible as history while no longer blocking on its own.
Suppression and unsubscribe have different scopes
“Suppression list” describes an enforcement mechanism. “Unsubscribe” describes a recipient's choice. A system may enforce that choice through a suppression record, a mailing-list preference, or both.
For example, someone can leave a weekly product newsletter while still needing a receipt for a purchase. Your sending logic must identify which preference applies to which email. See transactional email vs marketing email for that distinction.
A hard-bounce restriction is different. Calling the next email transactional does not repair an invalid address. A password reset needs a working destination too.
In your application, keep mailing-list preferences separate from the workspace suppression you inspect in Samva. Review both when a recipient is excluded. Removing a suppression does not renew a subscription, and changing a list preference does not resolve a bounce or complaint restriction.
For subscribed mail, RFC 8058 defines the one-click unsubscribe mechanism that mail clients can invoke. The endpoint must process the opt-out; adding headers alone does not enforce it. Our one-click unsubscribe guide covers that integration.
Is a suppression list shared across senders?
Scope depends on the system. A restriction might belong to a mailing list, a workspace, or the service handling delivery. Those boundaries matter when an address appears clear in one view but still cannot receive an email.
In Samva, the suppression entries you inspect and remove belong to your workspace. Delivery-level restrictions can also apply. Removing your workspace's entry does not guarantee that every delivery restriction is cleared, or that the next email will reach the recipient.
That makes the next delivery event part of verification. If a justified removal succeeds but the address remains blocked, preserve the email's identifier and failure detail and contact Samva. Repeated retries or switching sender addresses to get around the restriction do not resolve its cause.
How to inspect a suppressed address in Samva
Open Blocks in your workspace and find the address in the email suppression list. Review the reason, detail, status, date added, and expiry. Check for multiple entries: removing one reason does not settle another active restriction for the same address.
For an integration, use List suppressed addresses. The API supports filters for type, active or expired status, and an address substring, with limit and offset pagination. Because the address search is a substring match, inspect the returned email value to identify the exact recipient.
Read these fields together:
typeandreasonexplain why the record exists.bounceTypeandbounceSubTypegive bounce context when available.isActivestates whether the entry currently applies;expiresAtshows its expiry when one exists.messageIdcan connect the restriction to the email that caused it.
If the address is not actively suppressed, check its mailing-list preferences and the email's delivery history. A missing suppression record is not proof that delivery succeeded.
When should you remove a suppression?
Remove a suppression only after establishing why it is safe for that address to receive the intended email again. The evidence depends on the reason.
For a corrected address, update the contact to the destination the recipient actually verified. There is usually no reason to clear the old invalid address so that it can be retried. If the same mailbox has been repaired, confirm the repair and the recipient's request before lifting its restriction.
For an unsubscribe or complaint, verify a fresh, explicit request for the relevant email. An old signup, a purchase, or a contact import does not by itself reverse that decision. Record the request and update the applicable preference through your consent process.
For a manual restriction, review the original decision with its owner. For an expired record, establish whether any other active restriction remains before making an unnecessary deletion.
Once that review supports removal, use the dashboard action or Remove a suppressed address with the specific suppression ID. Then recheck the address's active records and applicable unsubscribe preferences. Observe the next legitimate requested email's delivery result; do not start a bulk resend to test whether clearing the list worked.
Suppression protects the rest of your sending by remembering failures and recipient choices. Keep that history useful, fix the underlying cause, and verify the outcome at the address level. For the wider picture, read how authentication, reputation, and suppression affect deliverability.
