December 2002
Intermediate to advanced
1232 pages
56h 38m
English
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Name
-o
Synopsis
Ordinarily, in the case of types that
employ disk files, sendmail will complain if a
specified file cannot be opened for reading. If the presence of a
database file is optional (as it can be on certain machines), the
-o switch should be used to tell
sendmail that the database is optional. Note
that if a database is optional and cannot be opened, all lookups will
silently fail for rules that use that database.
Also note that for network-based types of database maps, this
-o switch can be used to cause failed
initializations to be ignored. If a database map is used during the
processing of a message, and if a lookup fails in the absence of a
-o switch, the message (or SMTP request) will be
rejected with a temporary failure.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.