How do I identify campaign delivery failures?

Updated Nov 2, 2026

Combine the campaign's numbers with the Feedback Loop page.

Steps

In Campaigns, check the campaign's Bounces column and percentage.
Open the campaign report and its deliverability analysis.
On the Feedback Loop page, check Blocked & rejecting domains for the main reasons and codes, and Sending restrictions for active pauses.
Fix the cause (list quality, DNS, volume or content) before raising the volume again.

Related articles

How do I investigate SMTP rejection errors? Failed sends, bounce reports and their codes.
Why are my emails bouncing? Hard and soft bounces, and what MailRush does with them.
How do I identify blocked recipient mail servers? Use the Blocked & rejecting domains table.

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