This one is really odd. Traffic originating on the LAN side of the ER7206 destined for another host on the WAN side, but local to the WAN, is routed through the gateway for some reason. Interestingly...

@Tedd404 The update is the OC-300 sends an incorrect value (localhost) for the EHLO message and there appears to be no way to fix that. The example that you provided was significantly different than...

@Tedd404 Steps to reproduce "localhost" problem when sending SMTP mail from OC-300 controller: 1) Go to Settings->Server Settings 2) Configure an SMTP Mail Server 2.1) Enable SMTP Server. 2.2) Enter...

@Tedd404 I would love to post exact details on how to reproduce this but the forum software won't let me. Everytime I try and post the steps and results the forum tells me I'm trying to post "links"...

@Tedd404 That error comes from the controller logs that you can download from the controller UI. The actual log file is either server.log or startup.log. The error number from the SMTP relay is...

@Virgo Is it possible to get anything except localhost in there? Even just using omadacontroller would be better. A lot of SMTP relay servers are not accepting localhost.