SMTP problems: Host not found, try again

[david-8uUts6sDVDvs2Lz0fTdYFQ at public.gmane.org]

> On Tue, 2 Jun 2009, david-8uUts6sDVDvs2Lz0fTdYFQ at public.gmane.org wrote:
>
>> So I'm kinda sorta close to finishing my server rebuild, but I'm still
>> having issues.  One I would like to get solved asap is this SMTP issue.
>> This is Ubuntu Jaunty with postfix/dovecot.
>>
>> I see messages like this very frequently (email addresses redacted) in
>> the
>> logs and the output of postqueue -p:
>> 813404C5F7     2130 Tue Jun  2 03:47:36
>> particularization9-qIPW8QmpbdTTeotY1rLAZGXnswh1EIUO at public.gmane.org
>> (delivery temporarily suspended: Host or domain name not found. Name
>> service error for name=comcast.net type=MX: Host not found, try again)
>>                                         XXXXX-Wuw85uim5zDR7s880joybQ at public.gmane.org
>>
>> 809EE461A7     8687 Mon Jun  1 12:05:35  avengesp616-sdv56KyyKd+sTnJN9+BGXg at public.gmane.org
>> (delivery temporarily suspended: Host or domain name not found. Name
>> service error for name=acm.org type=MX: Host not found, try again)
>>                                         XXXXX-HInyCGIudOg at public.gmane.org
>>
>> and a bunch of other domains.
>>
>> "digg acm.org mx" returns the list of MX servers.
>> I can telnet to one or more of the XM servers on port 25.
>
> I'm guessing you're getting hit by temporary DNS resolution failures.  Do
> you run your own nameserver or using your ISPs NS?  If you're using your
> ISPs NS, I'd suggest installing bind as a local resolver or try switching
> to UltraDNS's nameservers to see if that helps.

I don't run my own.  I supposed I should at least run a caching
nameserver.  Right now I'm so swamped with all the broken stuff, I can't
think about that right now.

I'll have to look into which nameservers when I get home.  UltraDNS seems
like a pay service.  This is just me, so I don't know that I could justify
paying for DNS.

Thanks.