Redirect webmail to :20000 do not work

SYSTEM INFORMATION
OS type and version debian 12
Webmin version 2.202
Virtualmin version [7.20.2]
In web configuration> website redirect, the webmail.conf.isfsea.com does not redirect to conf.isfsea.com:20000

Hmm… It seems to work by default on mine with ‘factory settings’.

See my answer from this post, which still reminds me to open a bug-report on this one.