How to Check Your Email Deliverability Score
There is no single universal deliverability score, but combining bounce rate, complaint rate, and domain reputation from Google Postmaster Tools gives an accurate picture.
There is no single universal deliverability score that every inbox provider publishes, but a reliable picture of your deliverability standing comes from combining several specific, checkable metrics: bounce rate, spam complaint rate, and domain reputation as reported directly by major inbox providers through free monitoring tools.
Start With Google Postmaster Tools
Google Postmaster Tools is a free resource that shows exactly how Gmail specifically evaluates your sending domain. It reports domain reputation on a low, medium, high, or bad scale, along with spam rate trends, IP reputation, and authentication pass rates. Since Gmail represents a huge share of global email traffic, this single tool gives one of the most useful deliverability signals available.
Check Your Bounce Rate Directly
Your bounce rate, available in nearly every email sending platform's campaign reports, is one of the clearest deliverability indicators. A hard bounce rate consistently under 2 percent generally reflects healthy list quality. A rate climbing above that threshold is an early warning sign worth investigating before it affects broader deliverability.
Read more at primeverifier.com/blog/good-email-bounce-rate-benchmarks-2026
Check Your Spam Complaint Rate
Most sending platforms report spam complaint rate directly, and providers that offer feedback loops, including Yahoo, give additional detail on which recipients marked your mail as spam. A complaint rate above 0.1 percent generally warrants investigation, and above 0.3 percent typically results in noticeably more aggressive filtering.
Confirm Your Authentication Status
Tools like MXToolbox let you check whether SPF, DKIM, and DMARC are correctly configured and passing for your domain. Since major providers increasingly require full authentication before extending meaningful trust to a sender, this is a foundational check worth confirming even before looking at bounce or complaint data.
Run an Inbox Placement Test
Seed-based testing tools send a sample email to test inboxes across major providers and report where the message actually landed, inbox, promotions tab, or spam folder. This is the most direct way to see the practical outcome of your combined deliverability factors, since it shows the actual placement result rather than an indirect proxy metric.
Check Your Blacklist Status
Confirm your sending domain and IP are not currently listed on any major blacklists using a free tool like MXToolbox's blacklist checker. This is a binary check, listed or not, that provides a clear signal independent of the more gradual reputation metrics above.
Read more at primeverifier.com/blog/what-is-an-email-blacklist
Why List Quality Underlies Every One of These Checks
Bounce rate, complaint rate, and even domain reputation in Postmaster Tools are all directly affected by the quality of the list being mailed. A list full of invalid addresses generates bounces that show up immediately in every one of these checks simultaneously.
Verify your list free at primeverifier.com/register
Building a Regular Check-In Routine
Rather than checking these signals only when something feels wrong, reviewing them monthly, or before every major campaign, catches problems early enough to address them before they compound into a more serious deliverability issue.
Frequently Asked Questions
How often should I check these deliverability signals?
Monthly is a reasonable baseline for most senders, with more frequent checks warranted before and after any major campaign or significant change to sending infrastructure.
Is Google Postmaster Tools enough on its own?
It is one of the most useful single sources, but it only reflects Gmail specifically. Combining it with your own bounce and complaint data gives a more complete picture across all providers.
Is there a paid tool that consolidates all of these checks into one score?
Some enterprise deliverability platforms do offer consolidated scoring, though combining the free tools described above gives most senders a sufficiently complete picture without additional cost.
Should I check these metrics differently for a new domain versus an established one?
Yes, a new domain should be monitored more frequently during its warmup period, since reputation is still forming and more sensitive to any negative signal than an established domain with a longer positive history.
Are there free alternatives to Google Postmaster Tools for non-Gmail deliverability insight?
Yes, Microsoft's Smart Network Data Services offers similar visibility for Outlook and Hotmail, and several third-party inbox placement testing tools offer free tiers covering a broader range of providers.
Combining a couple of these free resources typically gives a sender enough visibility to catch developing problems well before they become severe. Building this into a regular routine, rather than a one-time check, is what actually protects deliverability over the long term. None of these checks require significant time investment once the habit is established. A consistent monthly check is usually all it takes to stay ahead of most problems.