By using sendmail, you have the added
advantage of being assured accuracy, which is especially important in large and complex
aliases files.
* Beginning withV8.10 sendmail, it was recognized that auto-rebuilding the aliases file posed a security risk.
For versions V8.10 and V8.11 use of this function was discouraged. Beginning with V8.12, this function has
been eliminated. (See ?§24.9.8 on page 978 for an explanation of the risk.)
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24 | Chapter 1: Some Basics
In addition to expanding aliases, the -bv switchperforms another important function.
It verifies whether the expanded aliases are, in fact, deliverable. Consider the
following one-line aliases file:
root: fred,larry
Assume that the user fred is the system administrator and has an account on the
local machine. The user larry, however, has left, and his account has been removed.
You can run sendmail with the -bv switch to find out whether both names are valid:
% /usr/lib/sendmail -bv root
This tells sendmail to verify the name root from the aliases file. Because larry (one of
root??™s aliases) doesn??™t exist, the output produced looks like this:
larry... User unknown
fred... deliverable: mailer local, user fred
1.7.6 Verbose Mode (-v)
The -v command-line switchtells sendmail to run in verbose mode.
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