[quote]What is decker.dreamhost.com
One of DH’s many mailservers TMK.
[quote]and why is it doing this?
I got the same problem a few days ago and Support said it was due to a mailserver outage. Since never in my experience does mail server outage cause false rejections (as opposed to just delay), and such unreliability would be a serious problem for me, I asked Support for clarification and await their reponse.