How many emails can be verified at once?

We have two entry points for email verification.

The first is a real-time API, that can accept a single email address at once; this is primarily focused on integration to systems that need to verify an email address immediately - for example, website signup forms.

The second is our batch system (which also has an API) - the most common usage of this is via our dashboard, uploading a CSV file with a list of the email addresses to be verified.

We actually have no file size limit for our batch upload methods - however, it should be noted that the larger the list of email addresses, the longer your upload will take and the results will take to be available.

As a general recommendation, we suggest keeping your files to a maximum of 1m records, which is approximately a 20Mb file.