How to split mailservices among two servers (no xsan yet)

How can I split the load on our mailserver (getting rid of the daily VM growth and potential crashes / down time) by using TWO servers as opposed to one?
Apparently the root of the cause is too many imapd connections and DirectoryServices then gets in to problems stalling the whole server (EG see my latest 3-4 posts)
SMTP out of the house should not pose a problem, and access for the end users to the (manually moved) imap data location should be handled easily after pointing the users to the second mailserver in WGM.
BUT incoming mail makes me unsure - port 25 can only be pointed to one server on the LAN (naturally , so how do I configure the ("primary") mailserver to make sure that the local mail-delivery (for the users that use the second mailserver) will actually be sent to this second server.
I would think that this should be easily possible - somehow - and that the LMTP service will be the part responsible for this change.
PS.: I still cannot understand why a dual 2 GHz intel server is unable to perform satisfactory - with 10.5.6 server - serving the small amount of IMAP users we have, ca. 250 users.
Currently ps ax | grep imapd | wc -l tells me that I have up to ca. 150 connections when the VM growth warnings starts to show up in the system.log

The server is still pretty much having the default setup, though I have implemented Pterobytes "Frontline Spam Defense", but:
A. I have incresed the number of processes as per an Apple article for "heavily loaded servers":
cat /etc/launchd.conf
limit maxproc 1000 2000
B. I have changed /ets/cyrus.conf
IMAP increased to 5
LMTPUNIX increased to 2
<pre> imap cmd="imapd" listen="imap" prefork=5
imaps cmd="imapd -s" listen="imaps" prefork=0
lmtpunix cmd="lmtpd" listen="/Volumes/Bric-RAID-03-up/Mail/imap/socket/lmtp" prefork=2</pre>
I got this advise from Pterobyte a year ago when I had problems with the performance of the old mailserver (the hw was a G4, the hint helped a lot!)
The timeout you refer to is not set in the config file (also not in a fresh in stall of 10.5.6), it's only listed (as 30) in /etc/imapd.conf.default.
But I presume that if the parameter is not set in my cinf file, then the default files settings are in effect(?)
I was thinking of changing this value just yesterday, but after reading the man imapd.conf I thought that it would not make any diference, since 30 is "the minimum":
timeout: 30
The length of the IMAP server's inactivity autologout timer, in minutes. The
minimum value is 30, the default.
I guess I have to make this chang anyway
The server is a dual 2 GHz intel with 5 GB ram (and still 4 vacant slots).
Today's top output looks like this (the server was rebooted 24 hours ago!)
Mail spool (currently ca. 120 GB) is on an RAID-5 xraid
<pre>Processes: 171 total, 2 running, 169 sleeping... 741 threads 10:57:37
Load Avg: 0.21, 0.16, 0.06 CPU usage: 3.39% user, 3.39% sys, 93.23% idle
SharedLibs: num = 12, resident = 44M code, 1532K data, 3200K linkedit.
MemRegions: num = 16009, resident = 625M + 27M private, 231M shared.
PhysMem: 708M wired, 942M active, 174M inactive, 1826M used, 3294M free.
VM: 18G + 373M 645958(0) pageins, 75(0) pageouts</pre>
I have been running Apples top-guide.pl script for a couple of days to monitor the servers "health" in general as well as I am logging the number of imapd connections every minute.
I dont find the numbers alarming.
During the max load yesterday (between 12.10-12.48) there was a peak of 210 imapd connection (users coming back from lunch and checking mail?).
<pre>Fri Feb 6 12:42:00 CET 2009: 210
Fri Feb 6 12:43:00 CET 2009: 210
Fri Feb 6 12:44:00 CET 2009: 210
Fri Feb 6 12:45:00 CET 2009: 209
Fri Feb 6 12:46:00 CET 2009: 210
Fri Feb 6 12:47:00 CET 2009: 209
Fri Feb 6 12:48:00 CET 2009: 210
</pre>
During these 8 minutes is also when I was logging the highest number of VM growth:
<pre>Feb 6 12:42:35 einstein DirectoryService[26]: Potential VM growth in DirectoryService since client PID: 0, has 875 open references when the warning limit is 500.
</pre>
top-guide.pl log's these vaulues:
<pre>
CPU usage: 300-s Reads/sec: Writes/sec: Net in/sec: Net out/sec: kernel
Time: user sys Idle avg. number MB number MB pkts Mb pkts Mb CPU%
12:46:29 8.0 3.8 88.3 87.4 0 0.0 65 3.1 2138 21.3 2081 11.4 3.7
12:46:39 5.8 3.7 90.6 87.5 4 0.1 30 2.8 2166 21.2 2108 11.2 3.9
12:46:49 5.4 4.5 90.1 87.5 0 0.0 22 3.1 2210 21.4 2180 11.7 4.0
12:46:59 10.3 4.6 85.1 87.3 0 0.0 54 3.1 2123 21.2 2091 11.4 3.8
12:47:09 13.8 5.2 81.0 86.9 0 0.0 46 3.2 2110 21.2 2071 11.4 3.9
12:47:19 4.7 3.1 92.2 87.0 4 0.1 24 2.6 2109 21.1 2073 11.4 3.7
12:47:29 5.0 3.8 91.2 87.6 0 0.0 58 3.3 2136 21.2 2110 11.3 3.8
12:47:39 5.4 3.6 91.0 87.6 35 0.5 61 2.9 2091 21.3 2042 11.4 3.8
12:47:49 7.9 5.9 86.2 87.5 61 0.7 54 4.8 2424 23.8 2409 13.8 4.5
12:47:59 5.2 4.1 90.8 87.4 0 0.0 52 3.7 2224 21.4 2222 12.2 4.0
12:48:09 15.9 5.9 78.2 87.0 0 0.0 25 3.0 2146 21.1 2127 11.8 4.0
12:48:19 7.4 3.4 89.2 87.1 0 0.0 15 2.6 2129 21.2 2111 11.8 3.6
12:48:29 4.9 3.7 91.4 87.2 0 0.0 34 2.9 2176 21.4 2158 11.8 3.7
12:48:39 4.9 3.7 91.4 88.0 0 0.0 18 2.6 2128 21.0 2118 11.8 3.7
12:48:49 5.6 4.5 89.9 88.1 0 0.0 35 2.7 2097 21.2 2082 11.7 3.7
12:48:59 6.8 4.6 88.7 88.0 0 0.0 60 3.1 2204 21.4 2228 12.1 4.0
12:49:09 5.6 4.0 90.4 88.0 0 0.0 15 2.9 2091 21.3 2072 11.7 3.6
12:49:20 13.9 4.9 81.2 87.6 0 0.0 14 2.7 2103 21.2 2084 11.6 3.7
12:49:30 9.1 4.0 86.9 87.5 1 0.1 70 2.8 2111 21.1 2129 12.1 3.8
12:49:40 7.4 4.8 87.8 87.3 1 0.0 52 4.5 2195 21.4 2200 12.0 4.1
</pre>

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