Why did my new contacts drop in Constant Contact?
The Constant Contact help pages give 4 common reasons. The first to rule out: Importing people who are already in your account updates their records instead of creating new contacts, so the import adds fewer new contacts than it has rows.
What causes it?
Importing people who are already in your account updates their records instead of creating new contacts, so the import adds fewer new contacts than it has rows.
In the Constant Contact help:
The existing contact is updated and the new list is added to their existing list memberships.
Import a file of email or SMS contacts, read 2026-11-12.Rows in an import file with no email address are left out, so those people are not added as contacts.
In the Constant Contact help:
A missing email address prevents a contact from being uploaded
Resolve warning and error messages after importing contacts, read 2026-11-12.A file Constant Contact cannot read can stop a whole import, so none of its contacts arrive.
In the Constant Contact help:
There are times when your whole import file or a contact is prevented from being uploaded into your account:
Resolve warning and error messages after importing contacts, read 2026-11-12.Contacts with typos such as a badly formatted email address wait until the errors are fixed, so they can arrive later than the rest of the import.
In the Constant Contact help:
Once these types of errors are resolved, the affected contacts are imported into your account
Resolve warning and error messages after importing contacts, read 2026-11-12.
How do I check it myself?
After an import, look for contacts held back by errors: the rest of the file can arrive while those wait.
In the Constant Contact help:
Typos happen, and when they do, we don't prevent your whole file from being uploaded.
Resolve warning and error messages after importing contacts, read 2026-11-12.If many rows were left out for having no email address, check that your spreadsheet's email column has the right header before importing again.
In the Constant Contact help:
If you have lots of missing email addresses, check to make sure the column of your spreadsheet has the correct header or add the missing email addresses, and then import your file again.
Resolve warning and error messages after importing contacts, read 2026-11-12.
How would I know the day it starts?
- Feder reads your new Constant Contact contacts and your active contacts each day and compares each day with your own history.
- It tells you when new contacts go quiet or either number moves outside its usual range.
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 what Feder reads from Constant Contact, which feeds Interest. Feder only reads. It never changes anything in Constant Contact.
What else goes wrong with these numbers?
- Why did my Constant Contact active contact count change?Constant Contact
- Why did my new contacts suddenly jump in Constant Contact?Constant Contact
- 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 Constant Contact 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.