Re: MacOSX-admin Digest, Vol 66, Issue 8
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Re: MacOSX-admin Digest, Vol 66, Issue 8
by Tim Roberts-4
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Also, forgot to ask if you have reverse DNS lookups configured.You probably
should since this is probably why sendmail takes longer to respond to telnet. Best, Tim Roberts Waterknot Music Pegram, TN On Wed, Jun 24, 2009 at 8:20 AM, Tim Roberts <imtimrob@...> wrote: > > > On Tue, Jun 23, 2009 at 1:51 PM, <macosx-admin-request@...>wrote: > >> Send MacOSX-admin mailing list submissions to >> macosx-admin@... >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://www.omnigroup.com/mailman/listinfo/macosx-admin >> or, via email, send a message with subject or body 'help' to >> macosx-admin-request@... >> >> You can reach the person managing the list at >> macosx-admin-owner@... >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of MacOSX-admin digest..." >> >> >> Today's Topics: >> >> 1. sendmail sluggish when opening connection (Brian Willoughby) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Tue, 23 Jun 2009 05:44:22 -0700 >> From: Brian Willoughby <brianw@...> >> Subject: sendmail sluggish when opening connection >> To: xadmin Admin <macosx-admin@...> >> Message-ID: <14204EAC-4C6F-4CCA-9C39-AF972F6AA586@...> >> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed >> >> Hi folks, >> >> I set up sendmail in place of postfix on my Tiger Xserve, and haven't >> touched it since 2007. I've been receiving tons of email and run a >> few mailing lists. >> >> However, I finally ran into someone who cannot send to me because >> their IT department has a 60-second timeout when sending via SMTP, >> and my sendmail daemon takes that much time to respond to a simple >> telnet connection. >> >> I'm not really sure when this started acting up, but I'm sure that it >> did not always take this long. Recently, I've had to shut down ssh >> access from unlisted ip addresses, due to attacks targeting my server >> (along with many others, I'm sure), but I think this is probably >> unrelated, since sendmail is not using ssh (yet) on my setup. >> >> I've also got a few options selected in sendmail to throttle incoming >> connections, by limiting new connections to one per second. That >> should not be causing a delay of 60 seconds, though, unless the >> parameter has the wrong units. There are probably a few other >> throttling options enabled, since the week before I installed this >> Xserve in 2006 I suffered a DoS attack attempting to scan SMTP for >> mailboxes. >> >> I tried editing /etc/mail/sendmail.cf to remove obvious things like >> TrustAuthMech KERBEROS_V5 and AuthMechanisms GSSAPI KERBEROS_V5, >> since I'm pretty sure I don't have those set up for sendmail anyway. >> But I still get the long timeout. >> >> Does anyone have any suggestions as you how I could diagnose this? I >> assume I could run sendmail in gdb, since I did compile in on that >> machine, but that doesn't seem like the smartest first step. >> >> P.S. Please don't tell me to switch to postfix, that's not going to >> be received as a helpful response. I've been using sendmail since >> the early nineties, and postfix is a bit of a step in the wrong >> direction for me. >> >> Brian Willoughby >> Sound Consulting > > > > Is sendmail set up to do IDENT lookups? > If so, try disabling. > > Best, > > Tim Roberts > Waterknot Music > Pegram, TN > MacOSX-admin mailing list MacOSX-admin@... http://www.omnigroup.com/mailman/listinfo/macosx-admin |
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