Earlier today, I posted about the ability to find previously deleted emails using the Spotlight search on the iPhone, adding to the already intense swarm of news surrounding this issue. My findings were that, by ensuring your trash folder was emptied and refreshed, the problem appeared to be solved.
However, many of you responded indicating that this did not work for you, and that you were still seeing cached messages. Then Cult of Mac posted an update to their original piece, suggesting that the problem was more specific to POP accounts. Although I had tested both POP and IMAP accounts with similar results, I decided to investigate further.
First, to clarify: The problem here is *not* with Spotlight caching the contents of your email, as many have suggested. Spotlight simply indexes the available content on your phone, and logs a pointer to it. When you tap a search result, it opens the associated application and tells that app to view the content. In this case, it sees an email message and asks Mail.app to open it, which it does, because Mail.app still has the message content stored locally. Secondly, this appears to be specific to POP accounts. On IMAP or Exchange accounts, deleted email messages do appear in Spotlight results until the trash folder is emptied, as described in my earlier post.
I created a fresh account and configured it for POP access, then downloaded the mail. Searching spotlight, I could see the message I was looking for. I then went back to the message and deleted it, and that's where the fun starts. I conducted this same test multiple times, and found that sometimes, the message would now show up in Spotlight twice, one result opened the message, intact, with the Inbox listed as the folder to return to; the other displaying a message in the trash folder, but with an error displaying the body of the message. Other times, I would only see one result, pointed directly to the trash.