I run the office lotto syndicate.
I get a results email that I want to detect via a filter, and forward to a group containing the lotto syndicate members.
Is this possible? I can't seem to figure it out..
Not directly, no.
You need to set up a mailing list, such as on Google Groups. (Really it could be any of a number of services. The key is that there is a single email address to use that will send all messages sent to it on to member email addresses.)
However, there's a bit of setup involved and your syndicate members will need to do a little work as well.
This is how I'd do it:
That should be it. You don't need to use Google Groups, obviously. There are other mailing lists/forwaring services out there. (Personally, I'd probably use an autoforward mailbox provided by my ISP. No need for invites there; I can add the addresses that I want.) The key is that you need to be able to prove to Google that the mailbox to which you want to forward messages is under your control.