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Hi treloskilo, That's a brilliant idea, thank you so much! I've implemented this and it is working well. I had to modify the command slightly: iptables -t nat -A PREROUTING -d <IP> -i eth0 -p tcp --dport 2525 -j REDIRECT --to-port 26 Thanks for your help it's really appreciated!

Hello all, We have been using Proxmox Mail Gateway for several years now and are very happy with the product and wish to thank all the team for making it possible. Our setup is the standard setup with External SMTP port: 25 Internal SMTP port: 26 All of this has been working fine for...