Comments on: DKIM and DomainKeys for qmail

By: John

John — Fri, 02 Dec 2011 03:04:08 +0000

Which domains are you getting the segfault on?

Can you check the size of the txt records? The maximum size for all txt records I believe cannot exceed 512 bytes.

I’m thinking that with large TXT records, qmail-smtpd might segfault (die with status 11) on some platforms… just like the an issue with the old SPF patch (http://www.saout.de/misc/spf/) for qmail.

By: Kinglok, Fong

Kinglok, Fong — Fri, 02 Dec 2011 00:55:40 +0000

Yes, me too. I encountered occasionally segmentation fault of qmail-smtpd. My system is Debian squeeze.

By: John

John — Fri, 02 Dec 2011 00:34:08 +0000

Hi Brandon,

I’ve noticed that with john’s combined patch 7.08 and your 7.08-dkim-r1 patch, I am occasionally getting segfaults with qmail-smtpd when verifying certain senders…

Getting the following in /var/log/messages
Dec 2 10:19:54 mailserver03 kernel: qmail-smtpd[25082]: segfault at 0000000000000000 rip 000000000040fdb2 rsp 00007ffff36d1348 error 4

Also getting tcpserver: end status 11 in qmail-smtpd log.

I am running on CentOS 5.6 x86_64 (2.6.18-238.9.1.el5). Any ideas?

By: Dave Martin

Dave Martin — Sun, 28 Aug 2011 15:11:18 +0000

Brandon,

Thanks for all your efforts. I especially appreciated that you took the time to document each step thoroughly. Being fairly new to this Linux/Qmail environment, it’s great to find a resource that doesn’t assume I’ll be able to “take it from there.” The examples and followup feedback were also very helpful.

Thanks again!

By: Kinglok, Fong

Kinglok, Fong — Tue, 23 Aug 2011 12:53:12 +0000

@zeescientist

If you are using debian, you can happily install libdkim by the following command:
apt-get install libdkim-dev

Also, I would not recommend using Kyle’s method since the server I maintained sends 80K+ per day and it hanged due to the signing. I will report if the same problem occur by using Brando’s method.

By: zeescientist

zeescientist — Tue, 23 Aug 2011 12:38:34 +0000

when I tried to compile libdkim I faced this errors
./libdkim.a(dns.o): In function `_DNSGetTXT(char const*, char*, int)’:
dns.cpp:(.text+0x6c): undefined reference to `__res_query’
dns.cpp:(.text+0x14d): undefined reference to `__dn_expand’
dns.cpp:(.text+0x1de): undefined reference to `__dn_expand’
collect2: ld returned 1 exit status
make: *** [libdkimtest] Error 1

could you please tell me what is the problem

By: Andrew

Andrew — Tue, 23 Aug 2011 05:12:32 +0000

@Thibs Send email to yahoo email.

By: DKIM setup notes – blog

DKIM setup notes – blog — Mon, 04 Jul 2011 14:48:47 +0000

[...] http://www.brandonturner.net/blog/2009/03/dkim-and-domainkeys-for-qmail/ [...]

By: Dave

Dave — Mon, 18 Apr 2011 05:17:23 +0000

@Thibs I tried it with john's 7.10 patch but qmail-smtpd was segfaulting so for now I'm using the qmail-remote wrapper. For now I'm only signing, not verifying, but spamassassin does some verification I believe.

By: selcuk

selcuk — Tue, 22 Mar 2011 19:58:35 +0000

hi,

thanks for explaining dkim for qmail. But i have a problem. when i send mail i got 533 error.