Sudden slowness to respond to mail

[rob]

Well it ended up being this in the sendmail.mc file:

dnl # FEATURE(`dnsbl', `relays.ordb.org', `"550 Mail from " $`'&{client_addr} " refused
- see http://relays.ordb.org/"')dnl

Once it was commented out, sendmail started responding in less then a second.  

On Tue, 09 Jan 2007 12:34:19 +0000, Martin.Hepworth wrote
> Load on the machine
> 
> Sendmail will delay then stop responding as the load increases - see the
> sendmail.cf for current settings.
> 
> --
> Martin Hepworth
> Snr Systems Administrator
> Solid State Logic
> Tel: +44 (0)1865 842300
> 
> > -----Original Message-----
> > From: mailscanner-bounces at lists.mailscanner.info [mailto:mailscanner-
> > bounces at lists.mailscanner.info] On Behalf Of rob
> > Sent: 09 January 2007 12:28
> > To: mailscanner at lists.mailscanner.info
> > Subject: Sudden slowness to respond to mail
> >
> > Not sure why but around 1:30pm yesterday, our Nagios server started
> > complaining that it
> > could not connect via SMTP to either of our MailScanner servers.  I
> > checked and we could
> > get mail back and forth from places like yahoo, gmail, etc.  Upon
> checking
> > the logs, we
> > are getting a flood of this:
> >
> > Jan  9 06:12:08 mail1 sendmail[22707]: l09CBX6l022707:
> > arm180.bigfootinteractive.com
> > [206.132.3.180] did not issue MAIL/EXPN/VRFY/ETRN during connection to
> MTA
> > Jan  9 06:12:31 mail1 sendmail[22709]: l09CBtI0022709:
> > airspan-218-44.33.radom.pilicka.pl [82.197.44.218] did not issue
> > MAIL/EXPN/VRFY/ETRN
> > during connection to MTA
> > Jan  9 06:12:34 mail1 sendmail[22715]: l09CBxwC022715:
> > e176093214.adsl.alicedsl.de
> > [85.176.93.214] did not issue MAIL/EXPN/VRFY/ETRN during connection to
> MTA
> > Jan  9 06:12:53 mail1 sendmail[22727]: l09CCMuB022727:
> jean.fleetone.com
> > [172.16.20.185]
> > did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
> > Jan  9 06:13:24 mail1 sendmail[22731]: l09CCnaI022731:
> > avh179.neoplus.adsl.tpnet.pl
> > [83.27.41.179] did not issue MAIL/EXPN/VRFY/ETRN during connection to
> MTA
> > Jan  9 06:13:38 mail1 sendmail[22735]: l09CD3H9022735:
> sv25pub.verizon.net
> > [206.46.252.161] did not issue MAIL/EXPN/VRFY/ETRN during connection
> to
> > MTA
> > Jan  9 06:13:57 mail1 sendmail[22742]: l09CDMxn022742: [59.39.93.106]
> did
> > not issue
> > MAIL/EXPN/VRFY/ETRN during connection to MTA
> > Jan  9 06:14:10 mail1 sendmail[22744]: l09CDZG5022744:
> > mailer204.ftl.sportsline.com
> > [64.30.226.39] did not issue MAIL/EXPN/VRFY/ETRN during connection to
> MTA
> > Jan  9 06:14:32 mail1 sendmail[22749]: l09CDvZU022749:
> srv2.worldnox.net
> > [204.10.36.240]
> > did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
> > Jan  9 06:14:38 mail1 sendmail[22751]: l09CE3uC022751:
> sv25pub.verizon.net
> > [206.46.252.161] did not issue MAIL/EXPN/VRFY/ETRN during connection
> to
> > MTA
> >
> >
> > I can see where sendmail is waiting though for a connect:
> >
> > [root at maryann mqueue]# ps -ef | grep sendmail
> > root      5324     1  0 Jan08 ?        00:00:01 sendmail: accepting
> > connections
> >
> > smmsp     5329     1  0 Jan08 ?        00:00:00 sendmail: Queue
> > runner at 00:15:00 for
> > /var/spool/clientmqueue
> > root      5335     1  0 Jan08 ?        00:00:00 sendmail: Queue
> > runner at 00:15:00 for
> > /var/spool/mqueue
> > root     21991  5324  0 05:38 ?        00:00:00 sendmail: server
> > [211.203.47.134] cmd
> > read
> > root     22872  5324  0 06:21 ?        00:00:00 sendmail: startup with
> > 88-106-220-38.dynamic.dsl.as9105.com
> > root     22873  5324  0 06:21 ?        00:00:00 sendmail: startup with
> > dsl.dynamic859769199.ttnet.net.tr
> > root     22875  5324  0 06:21 ?        00:00:00 sendmail: startup with
> > server.8disc.net
> >
> > root     22879  1468  0 06:21 pts/0    00:00:00 grep sendmail
> >
> > In doing a telnet to port 25 on each server, it is taking up to 35
> seconds
> > for sendmail
> > to respond on each box.  One server is CentOS 3.6 while the other is
> > CentOS 4.4.
> >
> > sendmail-8.12.11-4.RHEL3.6
> > sendmail-8.13.1-3.RHEL4.5
> >
> > What would cause the sudden slowness of the response?  I am not
> running a
> > greet pause in
> > sendmail.
> >
> > Thanks in advance
> >
> > Rob
> > --
> > MailScanner mailing list
> > mailscanner at lists.mailscanner.info
> > http://lists.mailscanner.info/mailman/listinfo/mailscanner
> >
> > Before posting, read http://wiki.mailscanner.info/posting
> >
> > Support MailScanner development - buy the book off the website!
> 
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