Hi all,

We have some loads that send subscribers in bulk to Klaviyo using the Subscribe Profiles to List endpoint.

The problem is, if there is one bad email or phone number in the bulk load, Klaviyo will reject the full request.

For example, if there’s a phone number like 999-999-9999, Klaviyo responds with an HTTP 400 and the error {"detail":"+19999999999 is not a valid phone number."}.

In order to prevent a single bad phone/email from breaking our bulk loads, we’d like to filter out bad emails/phones. Is there a list of emails/phones that Klaviyo rejects?

Thank you!