Unmarking email as spam

Some time ago, I had marked an email as spam by mistake in my phone. At the time I did not know of the swiping with three fingers trick. I had moved the mail back into my inbox, however all future emails from this sender have been appearing in my spam inbox. I have moved each message from junk, but they keep showing up there.

I have tried clicking on “more” but nothing shows up to unmark as junk. All it gives me options to do are move it, flag it, or send to junk.

I am using the standard apple email app, with a yahoo email.