When changing the "alias_domain" aspect of a domain, postfix maps are not re-exported
The value of the alias_domain
attribute affects the contents of postfix map files, but those files are not rewritten when this attribute is changed on a domain.
Workaround: After changing the attribute, either call mailman aliases
or create and delete a dummy list (easier in a docker install) to regenerate the files.
Fix would be to call regenerate() when the alias_domain has been changed (didn't find the right spot yet).