Date: Wed, 15 Oct 2003 23:54:51 +0200 From: Marko Leer <marko@half2.nl> To: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: sendmail, DNS and clientqueues Message-ID: <057857504.20031015235451@half2.nl>
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Hi all, I'm running a web/mailserver on a FreeBSD 4.8 box and I combine these two functions with PHP. To increase performance I deliver the emailmessages directly to the sendmail queue. Sendmail these days has two queues in /var/spool. As I understand it sendmail runs two daemons; one that's listening on port 25 for mail to send and another one that is monitoring the queue. If a message arrives for sending, a connection is attempted at port 25 of the localhost. This is a notourious slow operation on my dedicated server [I suppose because there's no named daemon running on the box; this is a sendmail defaultassumption that I don't know how to hack] If this connection fails [or the hostname of the sender cannot be resolved] this message is filed in /var/spool/clientmqueue instead of /var/spool/mqueue. All messages from the webapplications end up in clientmqueue, which is not constantly monitored. The sendmail -q command sends all queued messages in mqueue. Now I've been wondering for some time - if the assumptions above are correct - why this localhost lookup is slow - how to force sendmail to send the messages in clientmqueue - if there's a sendmailusersmailinglist anywhere on the web where this questions probably should be posted. So far I haven't found any information on these specific issues so ANY clues are greatly appreciated. TIA, =:0] Marko
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