Another Email?

"Err...Mark...The email you sent about stupid Peter...it's just popped up in my inbox!!!"

Pop up – popped up – popped up

Meaning: If something pops up, it appears suddenly or unexpectedly.

Grammar: This phrasal verb doesn't usually take an object.

A few problems have popped up

He popped up a birthday cake - NOT CORRECT
He popped up it - NOT CORRECT

Example sentence: She's really famous now – her photograph pops up everywhere – on TV,magazines and the internet too.

Synonyms: appear, arise, happen, occur, crop up, turn up, come up

From: BBC Learning English - http://www.bbc.co.uk/worldservice/learningenglish/