You are sending an email to a domain protected by the Symantec Email Security.Cloud service and are receiving a non delivery receipt (NDR) stating the email delivery failed.

553-mail rejected because your IP is in the PBL. See http://www.spamhaus.org/pbl

This error message indicates that your public IP address from which you are sending email has been put on the Spamhaus PBL block list.

You will need to submit a request to have your IP removed at Spamhaus Project - PBL.

The delisting process normally takes about 1 hour. If the problem persists, please contact the recipient by other means and request that your email address be added to their Symantec Cloud approved senders list.