How to Use Email Validation Services—and Understand their Results

The Sad Reality of Email List Churn

It is estimated that 30% of email lists turnover (become inactive) per year. Simply divide 30% by 12 months, and you will realize that upwards of 3% of your list could be deprecating each month. Sadly, a list generated from an event last week will already have some invalid email addresses. That means you need to update your email lists before you enter them into your marketing automation or email sending platform—so that you don’t negatively affect your email deliverability rate and compromise your sender reputation.

So how do you clean up lists before you load them? The best way is use an email validation service. They are easy and inexpensive (usually between .005 and .008 cents per email), and the best way to maintain the quality of the lists going into your email systems—or to validate a list you haven’t emailed in awhile (it happens!).

How to Interpret the Results of Email Validation Services

About nine different email validation services are available, and they all do approximately the same thing. They vary in their ease of loading data and understanding their reports. Here’s the ones we’re aware of in no particular order:

• Kickbox
• Snov.io
• ZeroBounce
• NeverBounce
• FindThatLead
• BriteVerify (by Validity)
• Bounceless
• Voila Norbert
• Hunter.io

The two we’re most familiar with and like a lot are NeverBounce and BritevBerify (by Validity). Once you load your list into either of these tools, you’ll almost instantly get a report showing the quality of the list. The report shows in a dashboard that gives you an idea of the list overall health, and then each email address is given a value. NeverBounce and BriteVerify have slightly different values, so we’ll talk about them separately:

NeverBounce

The dashboard report for NeverBounce looks like the image below (Figure 1). It gives you an overall report of how many emails were Valid, Accept All (Unverifiable), Unknown, Disposable, and Invalid. We explain what those values mean below.

Figure 1.

BriteVerify (by Validity):

The dashboard report for BriteVerify looks like the image below (Figure 2). It gives you an overall report of how many emails were Valid, Invalid, Unknown or Accept All. The values are very similar but a bit simpler than NeverBounce, which we like because quite frankly the extra detail in NeverBounce results isn’t that useful. We will explain what those values mean below.

Figure 2.

What the Deliverability Values Mean for Both NeverBounce and BriteVerify

When you get your list back from either of these services an “email status” column will be added to the list giving each email a deliverability value. When we first starting using the tools, the values seemed a little confusing to us and frankly hard to get clarity from their websites, so we’ll put a definition for the values for you below to save you time and aggravation. This will guide you on which emails to keep and which ones to think about not sending … or sending very carefully.

• Valid
• A valid email address has been verified as a real email that is currently accepting mail.
• SAFE—These emails exist and have been verified for safe sending.

• Invalid
• An invalid email address has been verified as a bad recipient address that does not exist or is not accepting mail. Invalid emails will result in a bounce.
• DON’T SEND—These emails do not exist and are not safe for sending.

• Disposable
• Disposable emails are temporary accounts used to avoid using a real personal account during a sign-up process. Common providers of disposable emails include Mailinator, Guerilla Mail, AirMail, and 10 Minute Mail.
• DON’T SEND—These emails are fake or temporary emails and are not safe for sending.

• Accept All (Unverifiable)
• This is also known as a “catch all”. This is a domain-wide setting where all emails on this domain will be reported as an “accept all”. There is no definitive way to determine whether this email is valid or invalid.
• An accept all address is commonly used in small businesses to ensure a company receives any email that has been sent to them, regardless of typos. Additionally, these are also found in larger government, medical and educational organizations. Oftentimes these are in fact valid emails. However some organizations may utilize this setting as a security feature to prevent unsolicited emails.
• SAFE—If you have a dedicated email server with your own IPs, accept all emails may be safe for sending dependent on the overall health of your list.
• DON’T SEND—If you use a third party email provider that requires a bounce rate below 4%, these emails are not safe for sending.

• Unknown
• We are unable to definitively determine this email’s status. This email appears to be OK, however the domain and/or server is not responding to our requests. This may be due to an issue with their internal network or expired domain names. Unknown addresses are checked up to 75 times before this result code is given.
• SAFE—If you have a dedicated email server with your own IPs, unknown emails are normally safe for sending.
• DON’T SEND—If you use a third party email provider that requires a bounce rate below 4%, these emails are not safe for sending.

The “accept all” and “unknown” emails are the two grey areas marketers struggle with the most because they can make up 10 to 15% of any given database validation effort. We’re often asked our opinion on what to do with those. The easy answer is don’t send them. The nuanced answer is you can try sending them little by little by breaking them into small bits such that if they all bounced your undeliverability rate for that email campaign would not exceed 10%. That takes some reverse math to figure out how big of an overall good deliverable email list to mix your questionable emails into. You have to decide whether it’s worth the effort and risk.

With email list verification tools like we’ve discussed here you can overcome email list churn and improve your deliverability. You might even be able to revive some lists that may have laid dormant during the pandemic and start emailing like a champ again. The tools are out there. Go for it!

by Laurie Beasley

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