I have two accounts set up. One gets junk email the other does not

I have two accounts set up to send and receive email. One for me and one for my wife.  On my account I receive junk email that has been sent to the junk email folder. Sometimes it is junk, sometimes it is not. My other account never receives junk email in the junk email folder and she has missed some emails.  Why is her account not filtering the junk email

eM Client does not really filter for junk.  It has a blacklist capability that allows you to specify certain domains/email addresses as spam.  Many email providers, such as Gmail, have those capabilities built into their systems and can be tweaked through their web-based clients.  There are also third party options for junk mail filtering.