September 2004
Intermediate to advanced
192 pages
10h 12m
English
Content preview from sendmail 8.13 CompanionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Chapter 21. The D (Define a Macro) Configuration Command
Defined macros allow
strings of text to be represented
symbolically inside a sendmail configuration
file.
What’s New with V8.13
The behavior and use of most defined macros has not changed in V8.13. However, the values in two have changed, and eight new macros have been added:
Two existing macros,
${auth_author}and${auth_authen}, now have their values stored inxtextformat (Section 21.1.1 [V8.13]).The new macro
${client_connections}holds the current number of connections to the listening server (Section 21.1.2 [V8.13]).The new macro
${client_ptr}holds the result of a PTR lookup of the connecting hosts IP address (Section 21.1.3 [V8.13]).The new macro
${client_rate}holds the number of inbound connections to the listening server over a specified interval (Section 21.1.4 [V8.13]).The new macro
${msg_id}holds the value of the currentMessage-Id: header (Section 21.1.5 [V8.13]).The new macro
${nbadrcpts}holds the number of envelope recipients for the current envelope that were not accepted (Section 21.1.6 [V8.13]).The new macro
${quarantine}holds the reason an envelope has been quarantined (Section 21.1.7 [V8.13]).The new macro $
{time}holds the current time in seconds (Section 21.1.8 [V8.13]).The new macro
${total_rate}holds the total number of inbound connections to the listening server over a specified interval (Section 21.1.9 [V8.13]).
The ${auth_author} and ${auth_authen} Macros
Some macros are assigned values ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.