Christopher,
Sorry to inform you, but since I am using a very recent snapshot of postfix it does
support lmtp "out of the box" as it were. And as I stated in my email, I am using
lmtp directly via the socket interface... (there's authentication issues if you try
to use a tcp connection, so I chose the socket method instead)
Anyone else want to give this one a shot?
And another question... I completely missed any references to hashed spools for
cyrus, consequently I ended up with an unhashed directory for the users mailboxes...
Is it safe to run the scripts provided to convert to a hashed structure? (I noticed
they were mainly for upgrading from 1.5x of imapd)
Thanks!
Andy H.
At 12:57 PM 2/10/2001 -0500, Christopher Audley wrote:
>I'm setting up a prototype for mail system that will use a similar set up
>and we will face similar problems with mass mailings. My understanding --
>and I would appreciate any correction/confirmation from the list -- is that
>this problem is addressed by LMTP and the lmtp deamon *assuming* you have
>your MTA using LMTP directly.
>
>When the MTA ( postfix here and in your description ) delivers the mail
>addressed to all via LMTP, the email is sent once with all of the addresses
>in the envelope. lmtpd takes the email and creates a disk file once for
>each partition where it is being received and hard links it to all other
>receiving mailboxes in the partition. In this senario, the overhead of
>sending the email to all verses sending to just one user should be small.
>
>However, postfix ( and I beleive qmail ) don't support LMTP directly "out of
>the box". In the case of postfix, a separate delivery process is available
>( see postfix website ) but it must be obtained separately. If you are just
>using the cyrus deliver program to communicate with lmtpd, postfix must
>spawn the program once for every delivery address ( a lot of process
>creation over head ) and lmtpd does not see this as a single mail with
>multiple delivery addresses but rather as many distinct emails. Each email
>is delivered separately, duplicating the message on the disk once for every
>receipiant.
>
>The LMTP update for postfix is found on the download page at www.postfix.org
>under "Unofficial patches". I don't know how well it works. Alternately,
>if you want to go with production versions of software, sendmail has native
>support for LMTP in the recent releases. You could move the postfix MTA to
>a separate machine -- it probably could be a lot smaller than your current
>mail host -- and have it deliver to sendmail on the mailhost via SMTP where
>it would then be delivered via native LMTP to cyrus. Sendmail LMTP is
>activated with a MAILER(lmtp) in your sendmail.mc.
>
>Hope this helps you, and I hope your not already using LMTP directly or I'm
>going to be in a world of hurt in a week or two :-) Let me know how it
>goes, I'm anxious to find out.
>
>Cheers
>Chris
>
>----- Original Message -----
>From: "Andy Hubbell, Jr." <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Friday, February 09, 2001 11:33 PM
>Subject: Performance Question cyrus-imapd 2.0.11
>
>
>> Greetings,
>>
>> Ok, time for another question... We are running a mail system (ISP) with
>just a bit over 4000 mailboxes at present... Our exact configuration is as
>follows: RedHat Linux 7.0 + patches, postfix snapshot 20010204 (MTA), and
>cyrus-imapd 2.0.11 system is a dual PIII 800 with 512mb ram, hardware
>mirrored 18 gig ultra scsi disks. Additional configuration information,
>postfix is configured to virus scan (amavis & Kaspersky
>AVPDaemon/AVPDaemonClient) then passes it back for lmtp delivery via unix
>socket.
>>
>> This is working quite well so far, but I have noticed performance
>slowdowns when a large amount of mail gets dumped on us at once... The main
>reason I'm asking is because we have an email list that goes to every
>customer who has a mailbox on our system, and when we send even a small
>email to the list it can take up to 3 hours for the system to finish
>processing and delivering to all of the mailboxes...
>>
>> Is there any way to drastically improve the performance of this system?
>Can cyrus-imapd perform some kind of directory hashing that I can turn on
>like postfix and other MTA's support? I understand the issues with linux
>and large directories, so this is why I'm asking about the hashing...
>>
>> I'm willing to listen to any tips, even up to changing the hardware set-up
>somewhat.... I somewhat under-estimated the size and load of this mail
>system when I first designed it and need to come up with a solution we can
>live with going forward as we grow. I've considered the possibility of
>switching to qmail vs. postfix, but it seems that the responsibility for
>delivery lies with cyrus & lmtpd...
>>
>> TIA!
>>
>> Andy H.
>>
>> ---
>> PGP public key fingerprint
>> FC3A FD71 8A43 E510 8797 6FD8 918C 1D54 17D9 9EC1
>>
>>
---
PGP public key fingerprint
FC3A FD71 8A43 E510 8797 6FD8 918C 1D54 17D9 9EC1
