What tools are useful for a deliverability audit?

When your emails start disappearing, you need to know where to look. A deliverability audit covers three areas: authentication, reputation, and inbox placement. Each area has different tools, and you don't need all of them at once.

So Start with authentication. Your SPF, DKIM, and DMARC records need to pass before anything else matters. You can check all three with Review My Emails' free checkers at reviewmyemails.com/tools/spf-checker and /tools/email-headers. MXToolbox and Dmarcian are also solid for a quick authentication pass/fail.

For reputation, Google Postmaster Tools shows your domain reputation, spam rate, and authentication success at Gmail. It's free and indispensable if Gmail is a significant chunk of your list. Microsoft SNDS gives you the equivalent for Outlook. Sender Score gives a quick numeric read of your IP.

For inbox placement, you need seed list testing. GlockApps and Mail-Tester show you where your email actually lands across different mailbox providers. These are especially useful when you suspect provider-specific filtering rather than a blanket reputation problem.

And one One more: check blocklists. MXToolbox's blacklist checker scans over 100 lists in one pass. If you're on Spamhaus, that's the priority fix. If it's a minor list, it may matter less.

You don't need to run all these at once. Authentication first, reputation second, placement testing if you're still stuck. If you want a shortcut, our free tools cover authentication and blocklist checking in one place. Or if you're in the middle of a crisis, our SOS hotline can walk through the audit with you live.