Performance issues with MS and SA

donald.dawson at donald.dawson at
Wed Mar 30 18:00:09 IST 2011

I would like to get some input from the community on our performance

Running 'MailScanner --debug --debug-sa' points to DCC as a bottleneck
and Bayes.

Turning off Bayes and DCC makes a big difference, but I would like to
keep DCC.

We are running 4 MX servers each with 4 CPU and 3.5 GB of memory.  We
process about 150k emails over the 4 MX servers, excluding rejected,
aborted and incomplete messages.

MailScanner:	4.83.4-1
SpamAssassin:	3.3.1
Scam-Back:	1.5.1-pre2 (checks email recipient against internal
Exchange server)
OS:		Fedora Core 8 (want to upgrade to RedHat Enterprise)
DCC:		Current version
Pyzor:		Latest - servers:
Razor:		2.84
Sendmail:	8.14.2 with:
	ClientRate:                     3
	ClientConn:                     3

Here's are our settings in spam.assassin.prefs.conf:

dns_available yes
bayes_path /var/spool/spamassassin/bayes
bayes_ignore_header X-BakerBotts-MailScanner
bayes_ignore_header X-BakerBotts-MailScanner-SpamCheck
bayes_ignore_header X-BakerBotts-MailScanner-SpamScore
bayes_ignore_header X-BakerBotts-MailScanner-Information
lock_method flock
use_auto_whitelist 0
ifplugin Mail::SpamAssassin::Plugin::DCC
dcc_path /usr/local/bin/dccproc
rbl_timeout 10
razor_timeout 10
pyzor_timeout 10
envelope_sender_header X-BakerBotts-MailScanner-From
score BAYES_00 -0.400
score BAYES_05 -0.300
score BAYES_20 -0.200
header __RCVD_IN_ZEN            eval:check_rbl('zen', 'zen.dnsbl.',
header RCVD_IN_XBL              eval:check_rbl('sblxbl-lastexternal',
'xbl.dnsbl.', '')
header RCVD_IN_SBL              eval:check_rbl_sub('sblxbl',
'zen.dnsbl.', '')
header RCVD_IN_PBL              eval:check_rbl('zen-lastexternal',
'zen.dnsbl.', '')
uridnsbl        URIBL_SBL       sbl.dnsbl.       TXT
score RCVD_IN_BSP_TRUSTED     -0.5
header  __FROM_YOURDOMAIN       From =~ /\@bakerbotts\.com\b/i
score   SPF_FAIL_YOURDOMAIN     1.0
score USER_IN_ALL_SPAM_TO -1.0
score FB_GET_MEDS 2.5
score   GENERIC_IXHASH 4.5
score   NIXSPAM_IXHASH 4.5
score   CTYME_IXHASH 4.5
score   DRUGS_ERECTILE 1.50
score RCVD_IN_DNSWL -1.00
score LOTTERY_PH_004470 4.0
score ALL_TRUSTED -0.5
internal_networks 204.194.96/21
internal_networks 10/8

Here is our custom MailScanner file in /etc/MailScanner/conf.d:

Max Children = 9
Queue Scan Interval = 10
Max Normal Queue Size = 2000
Unrar Command = #/usr/bin/unrar
Allow Password-Protected Archives = yes
Check Filenames In Password-Protected Archives = no
Allowed Sophos Error Messages =
Dangerous Content Scanning = no
Find Phishing Fraud = no
Also Find Numeric Phishing = no
Use Stricter Phishing Net = no
Highlight Phishing Fraud = no
Allow IFrame Tags = yes
Allow Form Tags = yes
Allow Object Codebase Tags = yes
Quarantine Infections = no
Information Header Value = Please contact Baker Botts IT Help Desk for
more information
Always Include SpamAssassin Report = yes
Sign Clean Messages = no
Mark Infected Messages = no
Mark Unscanned Messages = no
Notify Senders = no
Notify Senders Of Blocked Filenames Or Filetypes = no
Notify Senders Of Other Blocked Content = no
Virus Modify Subject = no
Filename Modify Subject = no
Content Modify Subject = no
Size Modify Subject = no
Disarmed Modify Subject = no
Spam Modify Subject = no
High Scoring Spam Modify Subject = no
Archive Mail = /var/spool/MailScanner/archive
Send Notices = no
Spam Checks = %rules-dir%/spam.checks.rules
Is Definitely Not Spam =
Is Definitely Spam = %rules-dir%/spam.blacklist.rules
Definite Spam Is High Scoring = yes
Ignore Spam Whitelist If Recipients Exceed = 40
Max Spam Check Size = 1500k
Use Watermarking = yes
Treat Invalid Watermarks With No Sender as Spam = 9
Watermark Secret = %org-name%-TvnSx97qf
Required SpamAssassin Score = 5
SpamAssassin Auto Whitelist = no
Rebuild Bayes Every = 86400
Wait During Bayes Rebuild = yes
High Scoring Spam Actions = delete
Log Speed = yes
Log Spam = yes
Log Non Spam = yes
Log Delivery And Non-Delivery = yes
SpamAssassin Timeout = 120

Donald Dawson
Security Administrator
Baker Botts L.L.P.
One Shell Plaza
910 Louisiana
Houston, TX 77002
W: 713-229-2183

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