Date: Sat, 18 Aug 2007 16:19:45 -0500 From: Tim Daneliuk <tundra@tundraware.com> To: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Silly Sendmail Tricks Message-ID: <46C76271.7080202@tundraware.com>
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Under FreeBSD 4.11-STABLE, among other things, I had this in my access file:
# Throttling Defaults
# GreetPause: 2000 # Set in the .mc file
ClientRate: 10
ClientConn: 10
# Don't throttle 127.0.0.1 or LAN traffic
GreetPause:127.0.0.1 0 # Time to wait before 220 msg
ClientRate:127.0.0.1 0 # Connections/interval
ClientConn:127.0.0.1 0 # Concurrent connections
GreetPause:192.168.0 0 # Time to wait before 220 msg
ClientRate:192.168.0 0 # Connections/interval
ClientConn:192.168.0 0 # Concurrent connections
Now, I've switched to FreeBSD 6.2-STABLE and it seems that the semantic
of "0 means no limiting" is no longer supported. With the configuration
above, the system starts throttling traffic generated on the localhost
when, say, a mailing list manager starts firing off a bunch of message.
I have to change things to:
ClientRate:127.0.0.1 1000 # Connections/interval
ClientConn:127.0.0.1 1000 # Concurrent connections
(I've not changed things for 192.168.0/24 because nothing on that network
sends email directly - or they shouldn't be - it all is routed via the
FreeBSD host.)
This fixed things - I can now send large volumes of email from localhost.
But, I wonder why the old setting does not work. Did something change in the
semantics of sendmail since 4.11 that could have caused this? Under
6.2 I have this for sendmail, BTW:
Version 8.14.1
Compiled with: DNSMAP LOG MAP_REGEX MATCHGECOS MILTER MIME7TO8 MIME8TO7
NAMED_BIND NETINET NETINET6 NETUNIX NEWDB NIS PIPELINING SASLv2
SCANF STARTTLS TCPWRAPPERS USERDB XDEBUG
============ SYSTEM IDENTITY (after readcf) ============
(short domain name) $w = xxx
(canonical domain name) $j = xxx.xxx.xxx
(subdomain name) $m = xxx.xxx
(node name) $k = xxx.xxx.xxx
========================================================
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter <ruleset> <address>
Inquiring minds wanna know ;)
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Tim Daneliuk tundra@tundraware.com
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