2.1.4 Address

Option group ‘address’ consists of options used to specify how to qualify email addresses.

An unqualified address (one without an @) is qualified by appending @defaultdomain. defaultdomain is the return of gethostname(), or the result of gethostbyname() on the return of gethostname() (if the DNS lookup is successful).

If the email address of the current user is needed, either the address set by --email-addr is returned, or the current uid is looked up in the user database, and qualified with the defaultdomain.

-E email

--email-addr=email

Set the current user's email address, this it makes more sense to use this in one of the per-user configuration files.

-D domain

--email-domain=domain

Set the default email domain, this might make sense to use in either the global or one of the per-user configuration files.