If you are using Postfix with our Outbound filtering system, and you need to forward your incoming messages, you may need to enable Sender Rewriting Scheme (SRS - http://www.openspf.org/SRS) for these forwards. This will cause the messages being forwarded to use your domain name, so our outbound filter will allow the messages to pass.
sudo apt-install postfix-pcre
sudo vi /etc/postfix/canonical
yourDomain.comwith your actual domain (this must be either subscribed or aliased on your SpamHero account):
canonical_maps = pcre:/etc/postfix/canonical canonical_classes = envelope_sender
This will set the Return-Path address for your outbound mail to
bounce@[yourDomain.com], which will be accepted by SpamHero.