Q: a friend's email goes into junk mail on all my computers and devices

Hi amlphoto,

iCloud allows you to manage junk email, and it also has a method for making certain that some messages do not get marked as junk. This artcle describes how to do it -

iCloud: Manage junk mail

Specifically -

Indicate that an email message isn’t junk

1. Click the Junk folder in the sidebar. 

2. Select a message, then click the Not Junk button in the top right of the message window.

 

The message is moved to your Inbox. Subsequent email messages from the same sender are no longer automatically marked as junk.

To keep your junk mail filtering consistent between your iOS devices and your Macs, use the steps in this article -

iCloud: Keeping the Junk folder consistent between iCloud Mail and OS X Mail - Apple Support

Thanks for using Apple Support Communities.

Sincerely,

Brett L