Re: [Exim] DNS or Exim issue?

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Autor: Ian Jackson
Data:  
A: Paul Walsh
CC: 'exim-users@exim.org'
Assumpte: Re: [Exim] DNS or Exim issue?
Paul Walsh writes ("[Exim] DNS or Exim issue?"):
> For some reason it seems that some mail from us occasionally gets bounced
> (by various Mdestinations) with the message
>     unrouteable mail domain "uce.ac.uk"


I ran my DNS zone checker[1] on your domain and it said:

chiark:~> chiark-named-conf uce.ac.uk
uce.ac.uk            foreign
uce.ac.uk                        ns1.uce.ac.uk [193.60.129.100] has 12849
uce.ac.uk                        www.uce.ac.uk [193.60.131.100] has 2003012901
uce.ac.uk                           ns1.ja.net [194.81.227.226] has 2003012901
uce.ac.uk                       isis.uce.ac.uk [193.60.130.111] has 2003012901
uce.ac.uk                     adroot.uce.ac.uk [193.60.129.189] has 12757
uce.ac.uk                    rootbkp.uce.ac.uk [193.60.129.182] has 12659
uce.ac.uk: warning: inconsistent serial number and/or SOA ORIGIN:
uce.ac.uk:   12757 adroot.uce.ac.uk from [193.60.129.189] adroot.uce.ac.uk, in glue from [193.60.129.100] ns1.uce.ac.uk, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
uce.ac.uk:   12659 rootbkp.uce.ac.uk from [193.60.129.182] rootbkp.uce.ac.uk, in glue from [193.60.129.100] ns1.uce.ac.uk, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
uce.ac.uk:   12849 adroot.uce.ac.uk from [193.60.129.100] ns1.uce.ac.uk, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
uce.ac.uk:   2003012901 isis.uce.ac.uk from [193.60.131.100] www.uce.ac.uk, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
uce.ac.uk:   2003012901 isis.uce.ac.uk from [194.81.227.226] ns1.ja.net, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
uce.ac.uk:   2003012901 isis.uce.ac.uk from [193.60.130.111] isis.uce.ac.uk, in glue from [193.60.131.100] www.uce.ac.uk, nameserver for uce.ac.uk
chiark-named-conf: 1 warning(s) in 1 zone(s); 0 zone(s) checked ok.
chiark:~>


(Sorry for the long lines.) So, the short answer is that your DNS is
buggered. It looks like you might have tried to change the serial
number scheme without a proper rollover.

[1] chiark-named-conf, part of chiark-utils,
ftp.chiark.greenend.org.uk:/users/ian/chiark-utils/
and in my cvsweb.

Ian.