I appreciate the response, and I understand that can be a problem in some situations. However, this has been a problem for us even when we are hosting our own email server and we are sending within the company without going through a spam filter. There have been a lot of posts in these support forums and on the internet at large regarding this issue. I know email is problematic, but there should be a notification from the copier that something is wrong or a retry button or something.
If we can send out many emails quickly from our email client applications, the copier should be able to do the same without falling over constantly, it's extremely frustrating. I help other offices with different brand copiers using the same mail service and they do not have this constant problem.