When i opened a mail which seem like spam, i was just wired looking at the mailbox. Check the below screenshot, actually the test was wrapped out of container

and the sender information and more options are displayed at the bottom of the mail. Gmail is yet not ready to come out of beta and it should work out bugs.. This bug appeard both in regular gmail and gmail for your domain. There are still other bugs to report.

Does that mail look wired without any sender information or more options at the top ?