DM> It's the other way around. Mail received via SMTP can be addressed to
 DM> de>.n<net>.z<zone>.fidonet and the mail message will be stored as FidoNet 
 DM> sysop@f<no l message which SBBSecho can then pack/route/etc.

So it has to be properly addressed to
name@f<f>.n<n>.z<z>/fidonet.yourdomain.com ?

If so, would it properly route it if you used an alternate net's zone? For
example, my SciNet node number is 77:1/100 so if another SciNet node received
and email address to netsurge@f100.n1.z77.fidonet.theirdomain.org it would
route it to me?

If so then that takes care of inbound gating, can sbbs do outbound gating?
Can I then netmail UUCP to the node's node with To: somename@email.com as the
first line of the body and have it email it out using the same email
convention as above?

frank // netsurge
disksh0p!bbs % bbs.diskshop.ca % mystic goodness 
SciNet ftn hq % https://diskshop.ca/scinet

--- Mystic BBS v1.12 A43 2019/03/02 (Linux/64)
 * Origin: % disksh0p!bbs % bbs.diskshop.ca % SciNet ftn hq % (1:229/101)