The algorithms guarding our inboxes have now developed to the stage that spam is usually kept at bay, but these auto-sorting processes aren’t perfect yet—if you’re not regularly opening up your spam folder to check on your email provider’s accuracy, you could well be missing some genuinely useful messages that you need to see.
While we can’t speak for everyone and every email app, we’ve noticed the occasional non-spam message get pulled into the spam pile. It’s still worth opening up your spam folder once in a while to check (spam is typically kept around for a few days before being automatically deleted).
Emails that land in your spam folder are unpredictable. Sometimes they do get in there, sometimes they don't. But, one of the simple tricks to prevent emails from landing in your spam folder is to ensure that you have the email person's/company's address added in your Contacts.
Don’t forget that most email providers also come with filtering options and ways to set up rules—if you find that important messages from one particular sender are always getting spammed, for example, you can set up a rule that ensures they stay in the inbox.
Here are some Quick Links on how to set-up filters based on who you use: