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  1. Peter Millington wrote on Oct 16, 2018 at 10:30 AM

    Installed Kopano4s, connected with LDAP, imported emails from 2 older Zarafa servers, Send/Receive/ActiveSync/IMAP/Fetchmail all working. Previously, all DNS/MX records setup to point to home network. I now realised the Container is in a Docker "bridge" network (which source NATs), so when I expose to the internet for receiving SMTP mail on port 25, all emails from internet and local users show as coming from the Docker host bridge address, so I cannot prevent Kopano being an "open relay" by source address filtering. Please can you advise how to prevent "open relay" function? I don't think all local systems can use authenticated SMTP.


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