ActivePipe runs an email validation service on all new contacts to pre-empt potential hard bounces and protect your mailing reputation.
Previously, if a contacts email address was flagged as invalid or non existent during ActivePipe validation, they would have been marked as unsubscribed by reason of Failed validation or Bad email.
Contacts that match this description are now designated as not subscribed. You can filter contacts by this subscription status to rectify and convert them into subscribed contacts.
You can also double check an emails validity using a third party site such as:
If you believe that any of your contacts have been marked as not subscribed in error, contact the ActivePipe support team (referencing the relevant email address/es) and our team will be happy to assist.