Junk mail

That all depends on how your mail provider defines things. Apple doesn’t determine what is or is not junk, but, to use yahoo as an example, that mail provider has algorithms to determine if something is junk or not (usually based on - gee our servers just got hit with 2058 copies of this same mail, may be spam - or perhaps key words. Names of male enhancement products, etc)

one way to tell your mail provider that something is not spam is to put the return address in your address book, or log into your mail provider and mark the spam as ‘not spam’. Apple mail will then follow whatever rules your mail provider sets up.

You need to do this through your mail provider. By that I mean, say you use yahoo and they keep putting a certain sender’s mail into junk. Sign into yahoo.com (via safari) and mark it as not spam. You may need to do this several times. Add that sender account to your contacts in Yahoo.

The apple mail account follows the rules your email provider sets so to fix things like this you need to go through them.

Mail is being diverted to junk, when it shouldn’t be. How to I correct this problem?