Send a test mail
Code:
$ mail test@example.com
[...]
.
Mail will be From: [username on localhost] <googleusername@googlemail.com>
Mail will often be dumped, if recipient is not
googleusername@googlemail.com
Code:
$ dpkg -l "exim4*"|grep ^ii
ii exim4 4.72-1 metapackage to ease Exim MTA (v4) installation
ii exim4-base 4.72-1 support files for all Exim MTA (v4) packages
ii exim4-config 4.72-1
...