Why did fewer emails come back as good in MillionVerifier?
The MillionVerifier help pages give 4 common reasons. The first to rule out: An address that does not exist is marked Invalid, so a list with more dead addresses returns fewer good ones.
What causes it?
An address that does not exist is marked Invalid, so a list with more dead addresses returns fewer good ones.
In the MillionVerifier help:
Invalid means the email address does not exist.
Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.Addresses from temporary email providers are counted as bad, so more sign-ups using them lower the good count.
In the MillionVerifier help:
Disposable means this email account is hosted on a temporary email address provider.
Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.Each result depends on how the recipient's mail server answers at the time of the check.
In the MillionVerifier help:
However, verification results depend on the response we receive from the mail server of the domain.
Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.MillionVerifier notes that an address found invalid may have existed before or may exist later, so the same list can score differently on another day.
In the MillionVerifier help:
But the email may have existed before or even later on.
Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.
How do I check it myself?
Before counting risky addresses as lost, check whether they are real subscribers who signed up recently.
In the MillionVerifier help:
RISKY (Catch-all and Unknown) emails may be safe to use if they are real subscribers and recently subscribed.
Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.Check whether the bad group grew because of invalid addresses or disposable ones.
In the MillionVerifier help:
Bad emails: They can be either invalid or disposable emails.
Managing Your Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.Download the report to see each address's result, including which are free or role addresses.
In the MillionVerifier help:
When you download a report, you will be able to see which email addresses are free and which ones are role.
Managing Your Email Verification Results - MillionVerifier Help Pages, read 2026-11-12.
How does MillionVerifier work with Feder?
- Connect MillionVerifier to Feder and it joins your Interest apps.
- When you connect MillionVerifier, Feder checks the connection straight away and shows Connected only when that check passes. If a reading cannot be taken later, Feder shows it as not read, never as zero.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.
See whether you can trust the numbers in MillionVerifier, one of your Interest apps. Feder only reads. It never changes anything in MillionVerifier.
What else goes wrong with these numbers?
- Why did my MillionVerifier API checks stop coming through?MillionVerifier
- Why is my MillionVerifier file stuck near the end with no results yet?MillionVerifier
- Why did Google Analytics stop collecting data?Google Analytics
- Why aren't my key events showing in Google Analytics?Google Analytics
- Why does Google Analytics show (not set)?Google Analytics
See every question.
Where do these answers come from?
Every cause and check on this page comes from the MillionVerifier help pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.