Upload a list
Uploading a file is the main way to verify a list. Open the Dashboard in the app and pick the Upload tab.
What you can upload
Section titled “What you can upload”| File types | .csv or .txt (export Excel or Google Sheets as CSV first) |
| Addresses per list | Up to 2,000,000 |
| File size | Up to 200 MB |
| Separators | Comma, semicolon, tab or pipe — detected automatically |
A sample file is available on the Upload tab if you want to see the expected shape.
How the email column is found
Section titled “How the email column is found”You don’t have to rename anything. EmailShield looks for a header such as Email, Emails, Email Address, E-mail, Work Email, Personal Email, Email ID, Mail, or any header ending in “email” or “mail”. Columns about email, like Email Status, are ignored.
If no header matches, it picks the column that holds the most addresses in the first 50 rows.
In a .txt file, put one address per line. A first line without an @ is treated as a header and skipped.
What happens before checking starts
Section titled “What happens before checking starts”- Duplicates are removed, ignoring capital letters (
Jane@Acme.comandjane@acme.comcount once). Duplicates are free. - Addresses that aren’t valid email syntax are marked Invalid — Invalid email format and never charged.
- Your other columns are kept and put back next to each address when you export.
- You’re charged 1 credit per remaining address, up front. Unknown results are refunded when the job finishes.
While the job runs
Section titled “While the job runs”You’ll be taken to the job’s results page. It fills in as answers arrive, and you can leave at any time — the job keeps running on our side. Mail servers are asked at a steady, polite pace so they keep answering honestly, so a large list can take a while.
To get an email when a job finishes, turn on Job completion under Profile → Notifications.
Other ways in
Section titled “Other ways in”- Paste — paste addresses separated by new lines, commas or semicolons. Good for a few hundred.
- Single — check one address. It runs as a one-address job and opens its result.
- API — up to 50,000 addresses per call. See the API quickstart.
- Inside LeadSonar — verify leads without leaving LeadSonar. See Find leads with LeadSonar.