Instead of poluting your otherwise pristine aliases file, include larger files using this syntax:

all_users: ":include:/filename"

This will allow you to email all_users@localhost and get all the users in the referenced file.

To force it to run through the queue (again), you can run:

# ${PATH_TO_POSTFIX}/postfix flush

There are a bunch of great switches for Outlook that you can use to automate some of your Windows mailing experience:

http://www.techgalaxy.net/Docs/Exchange/OL2003_switches.htm

Thanks Tucker for this URL!

If you have a system that might be changing versions multiple times you might orphan some of the lateral utilities (like newaliases). If you want to be certain that you're rehashing the correct aliases file (the one that sendmail.cf is referencing), run sendmail with the -bi option like this:

# /path/to/sendmail -bi

If your e-mail address returns entries in Google, you've compromised your e-mail to spambots and other evil parties. Never make your e-mail address public to the internet for everybody to see.

display the route from your server to any email address:

exim -bt email@domain.com

send an email using exim:

exim -v email@domain.com

show the number of emails in the queue:

exim -bpc

display the mail queue:

exim -bp

flush queue:

exim -qff &

view a particular mail in the queue:

exim -Mvh msgid (for headers)
exim -Mvb msgid (for body)