Sudden slowness to respond to mail

[Martin.Hepworth]

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
> --
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>
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>
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