How to test for blocklist impact on inboxing?

Testing blocklist impact involves checking your listing status and correlating it with delivery performance at affected destinations.

First, check your status against major blocklists using tools like MXToolbox or MultiRBL. Note which lists, if any, show your IPs or domains.

Compare listings with delivery metrics by provider. If Barracuda lists you and deliveries to Barracuda-protected organizations fail, you have found your cause.

Use placement testing to measure inbox rates at various providers. Compare results against which providers are known to use which blocklists.

Analyze bounce messages for blocklist references. Many rejections explicitly name the list that caused the block.

After delisting, retest delivery to confirm resolution.

Correlate the evidence. Match your listing status with where delivery fails to identify the blocklist impact.