Internal sendmail problems

Mark Blackman mark at blackmans.org
Wed Jan 2 16:40:43 GMT 2008


On 2 Jan 2008, at 16:26, Mark Blackman wrote:

>
> On 2 Jan 2008, at 16:15, O'Connor, Kevin wrote:
>
>> Mark,
>>
>> I ran tcpdump as you suggested and I'm seeing lots of the following
>>
>> 15:53:08.372068 IP (tos 0x0, ttl  64, id 25688, offset 0, flags  
>> [none],
>> proto: UDP (17), length: 57, bad cksum 0 (->ac3a)!) 10.10.0.4.58007 >
>> 10.10.86.10.53: [bad udp cksum 5042!]  46723+ AAAA?exchcluster. (29)
>> 15:53:08.372708 IP (tos 0x0, ttl 126, id 7951, offset 0, flags  
>> [none],
>> proto: UDP (17), length: 57) 10.10.86.10.53 > 10.10.0.4.58007:  
>> [udp sum
>> ok]  46723 ServFail q: AAAA? exchcluster. 0/0/0 (29)
>>
>> I have assumed that sendmail on FreeBSD has sendmail's
>> WorkAroundBrokenAAAA option but this appears to either not be the  
>> case
>> or the option fails to resolve the IP6 issue with W2K3 DNS servers.
>>
>> At this point any and all suggestions (That do not involve  
>> removing MS
>> DNS and/or Exchange) would be welcome.
>
> http://zaib.as/node/8
>
> appears to spell out the issue. I'd suggest rebuilding sendmail
> as per..
>
> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/questions/2006-07/ 
> msg01020.html
>
> *OR*
>
> use the ports system to replace sendmail with a different MTA,
> my personal preference is postfix.
>
> Possibly, you could rebuild the resolver library with different  
> options
> as well. To be honest, I'm surprised this issue still exists over a  
> year
> later.
>
> - Mark

There's a line in /etc/mail/sendmail.cf, whose removal may work to  
fix this case.

Try deleting the line with

O DaemonPortOptions=Name=IPv6, Family=inet6, Modifiers=O

- Mark





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