[AC Question]

Making more storage. Recommends junk mail

[ManiacJoe]

What phone?
What version of android?
What carrier?
What app is recommending the deletes?
What are the exact words of the recommendation?

[Rukbat]

Look in your email app for a folder named Junk. Look at the emails in there. If you don't need them, delete them. (Look for Spam and do the same.) Don't expect to regain much space - emails don't use that much room.