Deliverability
Handle bounces and suppressions
Hard vs soft bounces and keeping lists clean in EonMailer.
Bounces are normal; ignoring them damages reputation and wastes provider quota.
Hard vs soft
| Type | Meaning | Action |
|---|---|---|
| Hard (5xx permanent) | Address doesn’t exist | Suppress immediately |
| Soft (4xx temporary) | Mailbox full, greylisting | Retry; suppress after repeated failures |
| Block | Policy block at recipient domain | Review content/auth |
EonMailer suppresses hard bounces automatically when webhooks are configured.
Webhook requirement
Without provider events (SES SNS, SendGrid/Mailgun webhooks), bounces won’t auto-update. Complete webhook setup in provider connect guides.
Migration imports
When leaving old ESP:
- Export suppression/bounce list from old provider.
- Import to EonMailer before first send.
- Remove role accounts (
info@,support@) if they never opted in to marketing.
Monitoring
- Campaign report: bounce rate target < 2% on clean lists, never > 5%.
- Investigate spikes — bad import, stale list, or DNS failure causing bulk rejects.
AWS SES specifics
High hard bounce rate triggers account review. Pause campaigns if bounce spike follows bad file import.
Re-activation
Don’t unsuppress hard bounces without proof address was typo-fixed. Soft bounces may clear after 72h retry window.
See Complaint handling for spam reports.