how to redirect my domains using virtualmin

[machinakias]

Hello everyone! hope i,m in the right place...
I need your help,if someone knows..............

Here is my settings:
virtual web server running on 192.168.1.10
virtual mail server zimbra on 192.168.1.20
on my web server,i use virtualmin for administration and i redirect my main server to port 8080

i set my virtual domain in virtualmin,everything ok..then,i set up the same domains in zimbra...

when i hit domain1.com:8080 goes to zimbra login page and so when i hit domain2.com:8080 etc.....


what i want to do is to redirect every domainname.com:8080 to something like mail.domainname.com

anyone knows how to do it using a control panel like webmin or virtualmin?

Thanks in advice!