Email registration check

Find out whether email addresses are registered and can receive mail.

Checks you can order

Email registration check
Tells whether an email address is registered. Outlook, Hotmail, Yahoo, AOL and similar addresses are checked with the provider; other domains are checked with their mail server.
Columns in the result file
- Email

The input is email addresses, one per line, not phone numbers. Malformed addresses are not checked.

Representative output columns and masked sample rows exported in UTF-8 CSV format.

Number format
A UTF-8 TXT or CSV file with one column and no header, one international number with its country code per line (a leading + is fine). Up to 100 MB per file, or paste the numbers directly.
Billing
The quote counts the numbers left after removing duplicates and invalid entries; invalid numbers are not charged. The quote is reserved when you order, and once the order finishes you pay for the numbers actually processed. The rest goes back to your balance.
Result files
Successful numbers come in a CSV file and the others in a TXT file. Large orders are delivered in batches, so you can download finished parts while the order runs. A number in the unsuccessful file may simply not have been checked successfully this time; it is not proof the number is unregistered.
Countries and regions
International numbers with a country code are supported, except numbers from mainland China (+86).

Upload your list and CheckIM strips duplicates and invalid numbers for free, then gives you an instant quote for registration or activity checks.