This email data quality benchmark report covers:

You can have thousands of contacts in your database, but that doesn't mean they're all useful. Email data quality tells you how trustworthy your list really is. Are the email addresses accurate? Are they complete and up to date? It includes checking the presence of a mailbox, whether or not it accepts mail, the presence of active MX records on the domain, the address being valid or a temporary mailbox.

The most common metrics used by most marketers to evaluate the health of their email list are open rates and click rates. Both metrics can hide a data quality issue since they are based on engagement.

Experian's Data Quality Report indicates that organisations lose $12.9 million per year due to poor data quality from wasted spend, missed campaign opportunities and downstream operational issues. The damage increases with each email sent on an unverified list.

Data for the benchmark in this report has been collected from Mailchimp, Validity, ZeroBounce, MarketingSherpa, Campaign Monitor, Google Postmaster Tools and Litmus.

Most teams find a data quality issue when they turn to the bounce rate benchmarks. The term “hard bounce” refers to an email that could not be delivered permanently. If it fails temporarily, it's a soft bounce. The most important metric for deliverability is hard bounce as this signifies a permanent failure in the data quality.

Gmail and Yahoo now expect senders to maintain hard bounce rates below 2%. Any sender exceeding this limit will be subject to domain-level filtering that will impact inbox placement for all future sends.

The average bounce rate as per industry is listed below:

Every industry bounce rate is below 2%. When your campaigns exceed that threshold, the problem is rarely industry-wide. It is specific to how your particular list was built, sourced, or maintained before that send.

Individual campaigns run against unverified or aging lists frequently cross the 2% threshold even in sectors like ecommerce where the average is 0.45%. The benchmark protects you from false comfort.

Global inbox placement continues to slide. Industry-wide data now shows that 1 in 6 marketing emails fail to reach the inbox. It means ISPs are accepting more mail up front, but routing more of it to junk.

Global Email Deliverability Performance

Microsoft remains the toughest major provider for inbox placement, while Yahoo was the only MAGY provider to improve year-over-year.

Here are deliverability recommendations by Microsoft when changing ESPs:

The email data quality report’s data across all sources points to four factors that consistently predict deliverability outcomes.

There is a direct correlation between how often a team verifies their list and their inbox placement rates. Teams that verify before every major send achieve significantly higher placement than teams that verify annually or never. This gap shows up in sender behavior too. About 60% of senders now conduct list hygiene regularly, with just over a quarter doing it monthly or more.

Contacts acquired through double opt-in forms have far lower invalid and complaint rates than contacts sourced through third-party databases or manual prospecting.

SPF, DKIM, and DMARC authentication together can improve deliverability by up to 10 percentage points.

You must suppress unengaged contacts after 90 to 180 days of inactivity as this will lower your spam complaint rates.

Organisations with good list hygiene practices have inbox placement rates of 83.5%, according to the 2024 State of Email Report from Validity. The rate of decay varies among job functions.

This email data quality benchmark for invalid and risky address types varies significantly by industry and list source.

Invalid email addresses are addresses that fail at the mailbox level. The domain may exist, but the specific mailbox does not.

Disposable email addresses are temporary addresses created specifically to avoid follow-up. They tend to occur when someone signs up for a free trial without wanting to hear from the organization later and registers for an event without intending to hear from the organization again.

Catch-all addresses receive messages sent to invalid or non-existent email addresses within a domain. Enterprise and financial services organisations frequently configure their mail servers this way for compliance and archiving purposes. A catch-all address looks valid to a basic format check but may not deliver to a real person.

The email list quality benchmark data across this report points to the same set of fixes regardless of industry. Here is what to prioritise based on the evidence.

Clearout's Email Verifier runs 20 or more checks per address, including SMTP verification, MX record lookup, disposable address detection, catch-all scoring, and spam trap identification. Teams using Clearout before every major send consistently maintain bounce rates below 2% and improve open rates by removing invalid contacts.