For starters:
The lack of Multiple virtual host support for SOGo is my responsibility. 
@stephdl actualy did build it in (see “discussion” here ).
Reasoning I had (and have) : although NS can server multiple mail-domain aliases, In it’s gene’s it is a single domain solution.
IMHO, Providing multiple virtualhosts by default would lead to the expectancy of so-called multi-tenant functionality which is not present.
However It should be possible to create a reserve-proxy to add an (virtual) host to access SOGo.
Have forgotten how to do so but key is to add the /SOGo part in this proxy;
I think it is solved here:
grtz mark