How to properly set up a mail server behind mikrotik on a hypervisor?

Question

Mail server

Friends, please tell me how the following bundle should be set up according to "feng shui": there is one wire with two ip-addresses from the provider that comes to Mikrotik (RB951Ui), a piece of hardware on which proxmox is installed is connected to the microtic, CentOS with a mail server is installed on proxmox iRedmail. At the moment, a hack of the form 192.168 is configured on Mikrotik ... another piece of iron with 1Skay is also spinning in it, proxmox has a local ip, the mail server on the centos also has its own local ip, the ports necessary for the mail server are forwarded on Mikrotik (25, 143, 587 etc.) to the local address of centos. In general, everything works, but it seems to me that, to put it mildly, everything is set up not according to "Feng Shui". Still constantly netdata built into iredmail throws errors like: udp receive buffer errors, tcp accept queue overflows.

Answer 1

if the mail server really wants an external IP, then use VLAN. on microt access, on proxmox trunk, on CentOS again access. but in general, the external IP on the mail server is not "Feng Shui".
the best option would be to put the reverse proxy in the DMZ and assign it an external IP as described above. and from it to broadcast traffic on the necessary ports to the mailer. it's feng shui.