On linux with sendmail you might want to give different email addresses without having to create a new account or you can also
make small email list of a few people this way
The first column is the alias which will be forwarded to the real account(s) in the second column, REMEMBER the colon. You need to comma separate the different real addresses that the email should be forwarded to. You can skip the domain if the account are local and add the domain for mail forwarded elsewhere.
edit with vi or your kate
# Common aliases
spam: steve, firstname.lastname@example.org
Then run :
It will give you an error if you made a mistake other wise the output will be something like this.
18 aliases, longest 27 bytes, 294 bytes total