Wednesday, April 11, 2012

Posterous had a major DNS service glitch today

Yes - Posterous had a DNS problem today?

This morning (US Eastern time) I started getting bounces from my mail server when I sent email to my Posterous Blog -

Mail reported: 
Delivery to the following recipient failed permanently:

 {Email address AT}

Technical details of permanent failure:
DNS Error: Domain name not found

It seems that the main site was up and running, but any dub-domain was inaccessible. Somewhat inconveniently this included
The outages seemed to occur around noon and continued until after 3pm. 

While there is no mention on the Twitter account did make mention of DNS Server issues.

This snapshot from 5:50pm EST on April 12th:

Actually I tried sending this post to Posterous but the mail server responded with the same error. 

I suspect that a change was made to the Posterous Dynamic DNS Server that maps sub-domains to blogs and this change has not propagated across the internet. It could be that mail servers are still querying the old DNS server and failing. This may take time for any caching in the mail server to be refreshed. So while you may be able to browse to a Posterous blog page you may not be able to publish by email for a little while longer.