Strange DNS issue or is it surgemail?

On 10/9/06, Support ChrisP <surgemail-supportnetwinsite.com> wrote:
> >Hi All,
> >
> >Am having a strange issue which could be DNS
related or surgemail related.
> >
> >I have a number of emails that start to build up in
the queue, and it gets to
> >the point wgere a system restart is the only way to
cure this.
> >
> >They sit in the queue with either a DNS lookup
fail, (yet when I look up that
> >domain from my surgemail box it passes)or an error
like Open Error 0sec (399
> >TCP Read failed (Connection refused) 0 sec)
> >
> >However if I then change the DNS host to another
ISP's DNS server the mail
> >queue goes straight out, however the logs show that
after doing this every
> >message being sent appears as a DNS lookup fail, so
mail is not actually being
> >delivered!
> >
> >Anyone have any ideas on this?
> >
>
> It sounds like your dns server is at fault.  The first
step is to define g_dns_host as a single
> local dns server that you are sure works. Second check
firewall settings for port 53, it must be
> open for both tcp and udp access from surgemail to the
name server and from the name server to the
> world.
>
> If none of that helps, install a different dns server,
and make sure it does forwarding correctly.
>
> Let me know if you are still stuck.
>
>         ChrisP.
>
>

I'd feel much safer if SM allowed us to specify more than
one DNS
host. 2 is the usual number, 3 or even 4 would be nice.

sai

You can, I have 4 listed.

G_DNS_HOST
This setting can normally be left blank as the mail server
will find 
your system DNS settings. However, you can specify one or
more DNS 
servers for the mail server to use instead to lookup names.

DNS lookups are cached to disk so SurgeMail will generally
continue to 
work even if your dns server is temporarily unavailable.

Test your dns server with this command. If working it should
return two 
ip addresses for that domain.

  	tellmail dns_test "netwinsite.com"

If you change the dns_host settings a 'reload' is not
sufficient, 
restart surgemail.

Prior to SurgeMail 2.0h dns lookups were done using tcp
instead of udp, 
they are now down with UDP unless the response exceeds UDP
packet size 
(as per RFC).

NOTE: All dns servers listed in this setting must be fully
recursive, a 
non recursive dns server will create many dns lookup
failures!

sai wrote:
> On 10/9/06, Support ChrisP <surgemail-supportnetwinsite.com> wrote:
> 
>> >Hi All,
>> >
>> >Am having a strange issue which could be DNS
related or surgemail 
>> related.
>> >
>> >I have a number of emails that start to build
up in the queue, and it 
>> gets to
>> >the point wgere a system restart is the only
way to cure this.
>> >
>> >They sit in the queue with either a DNS lookup
fail, (yet when I look 
>> up that
>> >domain from my surgemail box it passes)or an
error like Open Error 
>> 0sec (399
>> >TCP Read failed (Connection refused) 0 sec)
>> >
>> >However if I then change the DNS host to
another ISP's DNS server the 
>> mail
>> >queue goes straight out, however the logs show
that after doing this 
>> every
>> >message being sent appears as a DNS lookup
fail, so mail is not 
>> actually being
>> >delivered!
>> >
>> >Anyone have any ideas on this?
>> >
>>
>> It sounds like your dns server is at fault.  The
first step is to 
>> define g_dns_host as a single
>> local dns server that you are sure works. Second
check firewall 
>> settings for port 53, it must be
>> open for both tcp and udp access from surgemail to
the name server and 
>> from the name server to the
>> world.
>>
>> If none of that helps, install a different dns
server, and make sure 
>> it does forwarding correctly.
>>
>> Let me know if you are still stuck.
>>
>>         ChrisP.
>>
>>
> 
> I'd feel much safer if SM allowed us to specify more
than one DNS
> host. 2 is the usual number, 3 or even 4 would be nice.
> 
> sai
> 
> 
> 

On 10/9/06, Stuart Chase <schaseelpasohonda.com> wrote:
> You can, I have 4 listed.

oh, great! Would that be comma separated or space separated?

> G_DNS_HOST
> This setting can normally be left blank as the mail
server will find
> your system DNS settings. However, you can specify one
or more DNS
> servers for the mail server to use instead to lookup
names.
>

Leaving this blank caused me problems (I was using Linux).
Works fine
if I specify a DNS server

Thanks!

sai

comma, sorry I should have mentioned that - I thought about
it and for 
some unknown reason hit send.

192.168.0.x,xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx

- for example, I've got my internal DNS (which forwards
out), then two 
ISP's dns's, then a friends DNS just in case.  just beware
of the 
needing recursion.



sai wrote:
> On 10/9/06, Stuart Chase <schaseelpasohonda.com> wrote:
> 
>> You can, I have 4 listed.
> 
> 
> oh, great! Would that be comma separated or space
separated?
> 
>> G_DNS_HOST
>> This setting can normally be left blank as the mail
server will find
>> your system DNS settings. However, you can specify
one or more DNS
>> servers for the mail server to use instead to
lookup names.
>>
> 
> Leaving this blank caused me problems (I was using
Linux). Works fine
> if I specify a DNS server
> 
> Thanks!
> 
> sai
> 
> 
> 

Thanks Stuart.

sai

On 10/9/06, Stuart Chase <schaseelpasohonda.com> wrote:
> comma, sorry I should have mentioned that - I thought
about it and for
> some unknown reason hit send.
>
>
192.168.0.x,xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx,xxx.xxx.xxx.xxx
>
> - for example, I've got my internal DNS (which forwards
out), then two
> ISP's dns's, then a friends DNS just in case.  just
beware of the
> needing recursion.
>
>
>
> sai wrote:
> > On 10/9/06, Stuart Chase <schaseelpasohonda.com> wrote:
> >
> >> You can, I have 4 listed.
> >
> >
> > oh, great! Would that be comma separated or space
separated?
> >
> >> G_DNS_HOST
> >> This setting can normally be left blank as the
mail server will find
> >> your system DNS settings. However, you can
specify one or more DNS
> >> servers for the mail server to use instead to
lookup names.
> >>
> >
> > Leaving this blank caused me problems (I was using
Linux). Works fine
> > if I specify a DNS server
> >
> > Thanks!
> >
> > sai
> >
> >
> >
>
>