Email Bounce Suspension in Sparkforge: Causes and Fixes

By Sparkforge Support Team ·Last reviewed May 3, 2026

Sparkforge suspends email sending if hard bounce rates cross 5%. The third strike in seven days is permanent until Email Verification is enabled and lists are cleaned.

High hard bounce rates damage deliverability for everyone on the platform. Sparkforge monitors bounces and suspends sending when rates exceed industry-safe thresholds.

Bounce types

Hard bounce: the address does not exist. Permanent failure.
Soft bounce: temporary failure (mailbox full, server down).

What triggers suspension

Healthy bounce rate sits between 0–3%. Sparkforge enforces a graduated block system:

Bounce rate	Action	Duration
3%	Warning email	Immediate
5%	Sending suspended	12 hours (1st block)
3% after 1st block	Critical warning	Immediate
5% after 1st block	Sending suspended	12 hours (2nd block)
3% after 2nd block	Final warning	Immediate
5% after 2nd block	Permanent suspension	Until manual review

During a suspension, only email sending is blocked. Every other feature keeps working.

Permanent block error

Email sending is blocked due to a high bounce rate. Unblock email sending by enabling the Email Verification Service.

Enable Email Verification first. If sending stays blocked, contact Sparkforge support.

How to request a permanent unblock

Open a support ticket with Sparkforge.
Include your subaccount ID.
Attach a screenshot or copy of the error.
Submit for manual review.

Support reviews send history, bounce rate, complaint rate, and list acquisition methods. Approval depends on compliance with email best practices and is not guaranteed.

Prevent future suspensions

1. Enable Email Verification

Agency view → Sub-accounts → click the sub-account name → enable Re-verification for 90 days. Verified addresses get marked as invalid before they ever ship to a campaign.

2. Use a dedicated sending domain

Set up a dedicated sending domain (for example replies.yourcompany.com) and authenticate it with SPF, DKIM, and DMARC.

3. Match sender email to the domain

Send from name@yourcompany.com when the dedicated domain is replies.yourcompany.com. Mismatches hurt authentication.

4. Send in batches

Use Batch (Drip) scheduling on bulk sends to reduce traffic spikes and let providers throttle gracefully.

5. Use double opt-in

Add a consent checkbox on every form. Capture explicit permission before any email goes out.

6. Include unsubscribe links

Every campaign and template should include a working unsubscribe link to keep complaint rates down.

Frequently Asked Questions

How long does a temporary suspension last?

12 hours. Enable Email Verification during the block to resume sending faster.

What counts as a healthy bounce rate?

0–3% is healthy. Above 3% triggers a warning. Above 5% triggers a 12-hour suspension.

Can a permanent block be lifted automatically?

No. Permanent blocks require a support ticket and manual review of your sending history and list practices.

Are non-email features blocked during suspension?

No. Only email sending pauses. Phone, SMS, CRM, and automation continue.

How do I find which contacts bounced?

Export Email Statistics, tag the bounced addresses, then use Smart Lists to exclude them from future campaigns.