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@Stoiko, thanks for the suggestions. Good plan to check pmgconfig dump, I will compare both pmg1 and pmg2. In the meantime, as you suggest, I have used the templating system to override the postfix config, prioritising reject_unauth_destination: smtpd_recipient_restrictions =...

Yes, I realise that PMG is never meant to be an open relay, hence my puzzlement at what I'm seeing - must be an error I've made but I can't locate it. So, pmg2 runs in an lxd container with a NAT network via a bridge to the host. Only ports 25 (smtp) and 8006 (web gui) are open via lxd proxy...

Using PMG 6.2-6 in a lxd container as a load-balance and fail over with another PMG in a vm. Container PMG called pmg2; vm PMG called pmg1. Run an open relay test from https://tools.appriver.com/OpenRelay.aspx shows "Relay NOT accepted" on all tests for pmg1, but "Relay accepted" for pmg2. I...