October 2007
Intermediate to advanced
1308 pages
161h 13m
English
Content preview from sendmail, 4th EditionBecome 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,
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F=m
Allow delivery to multiple recipients All versions
Whenever the sendmail program
executes the program specified by the P= delivery agent equate
(P= on page 748), that
program is given its argv vector as specified by the
A= delivery
agent equate (A= on page
738). As the last step in building that argv,
sendmail appends one or more
recipient addresses.
The decision as to whether it appends one address or
many is determined by the F=m delivery agent flag. If this flag
is absent, the delivery agent is given only one
recipient. Otherwise, if it is present, the delivery
agent can be given many recipients (subject to any
limitation imposed by the MaxRecipientsPerMessage option, MaxRecipientsPerMessage on page 1050).
In either case, if there are more recipients than
argv can
accept, the delivery agent is rerun as many times as
is necessary to handle them all.
Note that sendmail is able to distinguish only between failures involving one, many, or all of the recipients when it is delivering with SMTP or LMTP. Otherwise, it judges delivery as successful if a zero exit(2) value is returned by a delivery agent. If the delivery agent fails to deliver to one of many recipients, it exits with a nonzero value, and because of that single failure, sendmail will presume that delivery to all recipients failed. If the error is temporary, this can result in duplicate delivery to each recipient listed prior to the bad recipient.
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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.