Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsTo prevent unwanted email, store unsubscribe, complaint, and qualifying bounce signals in durable suppression state, then check that state immediately before every send. Also ingest your provider’s feedback events and enable its suppression controls where they fit. Provider lists differ in scope and visibility, so they should not be assumed to replace application-level records.
Build around three paths
A reliable design connects recipient choices and provider feedback to a single send-time decision. Keep the application’s suppression state current, and treat the provider as an additional control rather than the only place where eligibility is determined.
Unsubscribe path
When a user unsubscribes, persist the suppression before confirming success. Scope the record to the recipient and, when appropriate, the mailing list or message category; an unsubscribe from one category need not imply an unsubscribe from every kind of email your product sends.
For standards-based one-click unsubscribe, include the HTTPS endpoint in the message’s List-Unsubscribe and List-Unsubscribe-Post headers and accept the POST at that endpoint. Use an opaque or otherwise hard-to-forge token tied to the intended recipient and subscription scope. RFC 8058 says the sender must not redirect this POST because redirected POST actions may not work reliably: RFC 8058.
#1 Best Overall
Provider-event path
Consume bounce and complaint notifications from your provider. Validate notifications using the provider’s documented transport and authentication mechanism, normalize the affected recipient and event type, and update your suppression state idempotently. Repeated delivery of the same event should not create harmful duplicate work or make a suppressed recipient eligible again.
Send path
Immediately before calling the provider, look up the latest suppression state for the recipient and the relevant list or message scope. If the record says not to send, skip the provider call and record the reason. This send-time check is an application design invariant; the provider documentation does not prescribe one universal Node.js database or queue implementation.
Rank #2
Choose suppression scope deliberately
Suppression lists are not interchangeable. Before relying on a provider feature, establish what it covers, whether your application can query or manage it, and how feedback reaches your code.
- Scope: Determine whether suppression is account-wide, tenant-specific, configuration-set-specific, list-specific, or tied to an unsubscribe group.
- Visibility and control: Establish whether the application can inspect and manage entries, or only receives event feedback.
- Event delivery: Check available notification routes, Region or identity requirements, retries, and possible duplicate delivery.
- Event detail: Confirm how recipients, event identifiers, and permanent versus transient outcomes are represented, including whether one event can cover multiple recipients.
- Unsubscribe behavior: Check whether provider tooling manages preferences and how it handles one-click unsubscribe headers.
For example, Amazon SES documents account-level suppression for hard bounces and complaints, as well as configuration-set overrides and API operations to add or remove individual suppressed destinations. Its global suppression list is a separate provider mechanism and cannot be queried by the application. See the SES suppression list documentation and SES global suppression list documentation. SES account and Region context matters when configuring list scope and event notifications.
SendGrid describes suppressions associated with unsubscribe groups, illustrating a different scope model. See SendGrid unsubscribe groups. In either case, retain application-level state if your product needs an auditable policy or a consistent decision across providers.
Classify bounce events before suppressing
Do not treat every bounce as permanent. Amazon SES distinguishes permanent bounce subtypes—general, no-email, and suppressed—from transient subtypes such as mailbox-full, message-too-large, and other temporary conditions. AWS advises removing an address after a permanent bounce; a transiently affected recipient may become deliverable later. Map your provider’s event vocabulary deliberately instead of assuming that every event called a “bounce” means the same thing. See the SES notification contents documentation.
Rank #4
SES bounce, complaint, and delivery notifications use JSON objects with a top-level notification type and an event-specific object. A bounce notification may identify more than one recipient, so process every affected address. AWS also notes that notifications are not guaranteed to arrive in order and that multiple configured notification paths can result in duplicates. A robust handler must therefore tolerate retries, duplicates, batches, and out-of-order feedback; see AWS’s notification format and delivery details.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Make resubscription an explicit decision
Repeated unsubscribe or permanent-bounce feedback should leave an address suppressed. If your product permits resubscription, represent it as a deliberate consent event and define how it interacts with complaint and permanent-bounce signals. Do not let an ordinary profile update silently erase a provider or policy-based suppression. The exact record format and conflict rules depend on the application; the cited provider documentation does not establish one universal schema.
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Do not rely on provider rejection as prevention
A send accepted by a provider is not proof that it was delivered. Nor should a provider’s suppression response be your primary safeguard: SES documents that attempts to send to an address on its global suppression list can still count against sending quota and bounce-rate metrics. Check local suppression state before submitting the message, and use provider feedback to keep that state aligned. See SES global suppression list behavior.
AWS says an address can remain on the SES global suppression list for up to 14 days after a hard bounce, with the duration increasing after repeated hard bounces. That duration is specific to SES’s global list; it is not a general email rule and does not define how long an application should retain its own suppression record. See AWS’s description of the global suppression list.
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