Part 3: Top 3 iPhone Spam Filters (iOS 15 Supported) This will block messages coming from people who are not in your contact list from getting into your inbox. From this menu, slide the “Filter Unknown Senders” to turn it on.Click on Messages to open the Message Menu.Go to the Settings button on your iPhone.This feature is however available on iOS 12 and above. This is also another way you can filter spam directly from your iPhone, without logging into your desktop. Part 2: How to Filter Spam Messages on iPhone You can also block junk emails from your iCloud by using the Mail rules. All mails coming from this person will be blocked and won’t find their way to your inbox. Click on the options arrow and then select “Block ‘this Person’”.Open the message that the person sent you.The reason for doing this is that iPhone does not provide a means to block spam mails from your individual mail apps, you will therefore need to log onto the desktop version to block them.
This can be Gmail, Yahoo mail, Hotmail, etc.
There are also many ways to deal with junk mails even without an iPhone spam filter, the following steps are ways of blocking mails sent from unknown persons. Part 1: How to Block Junk Email from iPhone