I’ve noticed that Gmail is flagging all my forwarded mail as spam. The domain I’m using has a catchall, so anything sent to any address at that domain gets forwarded to my gmail. The issue is that this causes SPF to fail (by design), and Gmail consequently marks it as spam.
The correct way to handle this is using SRS (http://www.openspf.org/SRS). That page says that Postfix does not have a plugin interface that makes it possible, but the page was last edited in 2008 so things have hopefully changed since then.
Is there a way we can have Virtualmin properly configure this for forwarded email? Or does anyone know some manual config edits I can make to enable it that will play nice with Virtualmin?