Because one of the most common causes of not receiving specific emails is that you might have applied a custom filter at some point in time.
Solution 1 – Change the Advanced View Settings– If you are also facing the missing emails from your Inbox, then you should try changing the custom filter settings. Try automated tool Kernel for Outlook PST Recovery to repair and recover mailboxes from corrupted PST file. Now, let’s discuss how you can get back all those missing emails there are many ways to get them back, and we will discuss them one by one. To solve the issue of the unsynced email, you can check your internet connectivity or click on the Send/Receive tab on the top of the Outlook screen and click on Send/Receive All Folders, and all your emails will be synched. But missing emails are when you are not receiving a certain type of emails or any email even with a good internet connection. So, to give a better picture, here is an explanation to it: unsynced emails are those which are not yet updated with your account either because of bad internet or because of any server instability, but sooner or later they will get synched as the connectivity is established. There are scenarios where people confuse unsynced email with missing emails. This can be due to any technical glitch, or there might be something wrong with your settings. There are times when Outlook users complain about how they are unable to see their Inbox emails.