New domain's Sitemap.xml file loaded to old domain - how does this effect SEO?

[julesae]

I have a client who recently changed their domain when they redesigned their site. The client wanted the old site to remain live for existing customers with links to the new domain. I guess as a workaround, the developer loaded the new domain's sitemap.xml file to the old domain. What SEO ramifications would this have if any on the primary (new) domain?

[GeorgeDavis]

Chances are the client didn't have the foresight to match URL's, which means the sitemap contains many invalid URL's.  I do not know what exact effect this will have, but it can't be good.

[jesse-landry]

Whatever ramifications it had, nothing a sitemap reports is permanent. So just fix it and move on and it will quickly refresh. Be sure and submit it in GWMT just to be extra sure.

[julesae]

That is a great point. I've just never seen something like that before - questionable, very very questionable.

[KevinBudzynski]

I don't believe any. Like Jesse said, change it and move on (Google is fairly forgiving).