/etc/dkim-filter.conf should not have "Domain *" entry

The configuration file /etc/dkim-filter.conf should not have a "Domain *" entry because it is not needed and causes problems with system emails sent by scripts and websites.

In fact the "Domain" entry can be omitted all together.



The latest Virtualmin release shouldn't set the "Domain" directive at all, unless it is already set in dkim-filter.conf.

You can fix this by turning off DKIM in Virtualmin, editing /etc/dkim-filter.conf and commenting out the Domain line, then re-enabling DKIM.