sendmail: command line alias expansion
Contributed by Michilimackinac 
Tagged: Sendmail Expand an alias using the command line
sendmail -bv
so assuming an /etc/mail/aliases file that looks like this:
root: ricardo
postmaster: root
An example…
# sendmail -bv postmaster
ricardo… deliverable: mailer local, user ricardo
The command will expand postmaster to root to ricardo in this case sendmail does not tell you about any aliases in the middle (e.g. root in this example)
You may also like -
Keep watch on the number of instances of a process
sendmail: process the queue manually when the load average is high
expanding aliases in postfix
update files in a solaris package without rebuilding the package
sendmail: process all mail to a certain user
sendmail: process mail from user
Solve: Can't connect to local MySQL server through socket /tmp/mysql.sock
Cisco: Making long commands short with aliases