Wireless Ethernet Bridge blocking traffic

I've got a bridge setup to connect a printer that is about 75' from the router, in an old building where it is nearly impossible to run cable without big expense. Using latest Shibby on a e2500, also tried a RT-N12. Printing works great, no problems on either model. Can access the printer GUI and router, no problem.

But when I try to ping from within the bridge, or, do a Scan to Email from the printer, the email fails, unable to find smtp. However when I roll the AIO over to the router and...

Wireless Ethernet Bridge blocking traffic