rpnmtb Hello and appreciate the support. Unable to send email from a Mac client or iOS client. I get the following error in zcore: exmdb_client: HX_inet_connect to [::1]:5000: Connection refused No issues with receiving. No other system issues. IPV6 is enabled as well. I can telnet to the port from the grommunio server on ::1 5000. I can also send email from windows clients and the web client.