Date: Tue, 12 Jun 2007 23:30:13 +0800 From: Foo JH <jhfoo-ml@extracktor.com> To: Olivier Nicole <on@cs.ait.ac.th> Cc: freebsd-questions-local@be-well.ilk.org, freebsd-questions@freebsd.org Subject: Re: Shorten delay in sending mail to SMTP Message-ID: <466EBC05.3020202@extracktor.com> In-Reply-To: <200706120949.l5C9nrPB088807@banyan.cs.ait.ac.th> References: <466CB2DF.30808@extracktor.com> <9ADFB3BA-F02E-458D-80C1-2F13EAC769EF@mac.com> <466E695E.8030300@extracktor.com> <200706120949.l5C9nrPB088807@banyan.cs.ait.ac.th>
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Olivier, I have no visibility on the delay on which external smtp servers deliver mails to my mail server. Once a mail is sent out of my mail client, the mail can be received immediately through my imap client. To give a more detailed picture on load, my Qmail does not really a heavy load. I'd say at 9 times out of 10 there are no mails in the queue. Everything is stored locally so I have no reason to suspect internal network delays and all. My suspicion with the delay being related to dns lookups, is partially also because I wait a couple of seconds less when I am sending from within the same service provider. Yet when I (for example go home and) send from another service provider, the delay is longer (by a couple more seconds). Do note that I am on all tests on broadband, so we can assume network delay is negligible. Can anyone confirm that Qmail/ inetd/ FreeBSD does some form of dns lookup on it's SMTP? > Do you receive email from outside world on this machine? Do you think > there is the same delay? > > How do you notice the delay? After Thunderbird mentionned that the > email was successfully sent, you immdiately try to get new email from > your inbox and it takles time? > > How big is your inbox? What mailbox format are you using? Are the disk > local or network mounted? How much loaded is your machine? How many > emails do you receive at time? Do you read with pop or imap? Are > pop/imap launched by inetd or they are daemonized? Do you have any > anti virus/spam facility? Do you implement some fancy MDA like > procmail? > > Remember that email is not instant messaging, but store and forward: > it is a slow and batch processing, it is dessign to support delay and > certainly the design should generate some. > > If the delay remains 5 seconds when your server process 1 or 10000 > messages per hour, then there is nothing to worry about. > > Authentication should effect only to sending, it deals with the > communication between Thunderbird and qmail. It has nothing to do with > reading your mailbox and should have nothing to do with the in between > delay. > > Bests, > > olivier >
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