Spam email (gmail) disappeared as I clicked on it
So first off, I know, don't click on spam.
I'm using Acompli on my iPhone 6. I saw a spam message (gmail account) and I click on it to then move it to the spam folder. Only when I clicked on it, it simply disappeared. It's not in spam, it's not in my All Mail tab, it just vanished.
Anyone have any thoughts? Did it launch some flaky trojan? Should I wipe my phone?
Thanks!
MacBook Pro, OS X Mavericks (10.9.5)