Performing an Email Sending Reputation Audit – All You Need to Know

Email sending reputation, composed of IP and domain reputation, is a major determinant of whether marketing and transactional messages reach inboxes, spam folders, or fail delivery, while also helping mailbox providers identify fraudulent senders. Its assessment varies by ISP but commonly depends on bounce rates, recipient engagement, blocklist listings, spam traps and complaints, authentication through SPF, DKIM, and DMARC, unsubscribe rates, and sending volume and frequency, particularly for new IP addresses. Senders can evaluate deliverability and reputation using tools such as GlockApps, Mail-tester.com, Postmark Spamcheck, Sender Score, and MXToolbox, while platforms such as Mailtrap combine testing, sending, analytics, alerts, logs, IP warm-up, and safe staging environments. A useful audit begins by defining objectives, selecting relevant metrics and appropriate testing tools, reviewing findings, and implementing fixes independently or with deliverability specialists, with audits repeated when campaign performance declines or recipient complaints increase.

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