We are using SmarterMail Enterprise 100.0.8025.26489 with three Incoming Gateways running SmarterMail Free 100.0.8025.26489 setup with "Domain Forwarding" using "SmarterMail Gateway Mode" with "Web Service User Identification".
Remote deliveries through the Incoming Gateways works as expected for previously EXISTING users. However, after creating a NEW user on v100.0.8025.26489 all external deliveries to that user through the Incoming Gateways bounce with rsp "550 Relay Not Allowed". This is happening on multiple domains.
Local deliveries to these NEW users works fine.
We have reloaded the Domain. Restarted the SmarterMail Service on all servers, and rebooted all servers, yet problem continues to exist for NEW users.
We create new users pretty frequently so this appears to have occurred beginning with v100.0.8025.26489.
This is severe enough of an issue I'm willing to open a Support Ticket if needed.