We've moved one of our clients' sites that was on a server running IIS6 to a server running IIS7. They fairly regularly send out bulk emails - roughly 5000 - with no problems.
Now that the site has been moved to the new server, none of the emails seem to be sending, although the actual code for sending the emails hasn't changed.
I don't really know very much about IIS but I was wondering if anyone could tell me if IIS7 deals with bulk emails in a different way to IIS6? Or if there is something else that it might be.
Also, why would none of the emails be sending if this is the issue? Wouldn't at least some get sent out?