Q0422

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How can I arrange for all addresses in a group of domains *.example.com to share the same alias file? I have a number of such groups.

For a single group you could just hard wire the file name into a router that had

domains = *.example.com

set, to restrict it to the relevant domains. For a number of such groups you can create a file containing the domains, like this:

*.example1.com    example1.com
*.example2.com    example2.com
...

Then create a router like this

domain_aliases:
  driver = redirect
  domains = partial-lsearch;/that/file
  data = ${lookup{$local_part}lsearch*{/etc/aliases.d/$domain_data}}

The variable $domain_data contains the data that was looked up when the domains option was matched, i.e. example1.com, example2.com, etc. in this case.