multiple subdomains (no replies)

Hello,

I want to realize the following:

mail.domain1.com --> mail.domain1.com
mail.domain2.com --> mail.domain2.com
mail.domain3.com --> mail.domain3.com
mail.domain4.com --> mail.domain4.com
mail.domain5.com --> mail.domain5.com

It has to be like this, because there is another nginx integrated in the application software ...

I already read about variables in proxy_pass but didnt succeed. :(

any hints would be appreciated!


kind regards,
pwe