Mail randomly displaying sent items in inbox

Sorry I posted this (below) without seeing that the original poster got the answer already. I can't seem to delete my post....

This was easily solved by the advice given by "SpottedOyster": When in the Mail app, click Mail at the top, then Settings, and then uncheck "enable message follow up suggestions." This must be a new option Apple thought might be useful, but obviously not all of us would agree!

I solved this problem by unchecking "enable message follow up suggestions" in the mail settings/general settings window

Thanks, SpottedOyster. Mail: Settings > General > Follow Up Suggestions was the culprit for me, too, on Ventura 13.6.3. Toggling it off solved the issue.

mbrando, 

We’re wondering if something may have gotten changed in how things are displayed in your inbox or even just in general. For example, you can turn a filter on and off to change whether the messages are showing unread first or chronological order. Additionally, you can open a new ‘Inbox’ window that may also help reset some of those things for you. We’re including a link to the user guide, because it has a screenshot with the filters button pointed out as well as ways to change how things are being shown - Read emails in Mail on Mac

Change which emails are shown

In the Mail app on your Mac, do any of the following:

• Filter messages: Click the Filter button at the top of the message list to enable message filters, choose View > Filter, then select or deselect filters. You can also click and hold the Filter button, then choose options from the menu that appears.

• Show messages from one mailbox: In the Favorites bar or the Mail sidebar, click the mailbox.

• Show messages from several mailboxes: In the Mail sidebar, select multiple mailboxes. 

• Show messages from a specific email account: Click the arrow next to a mailbox (for example, Inbox) in the sidebar, then select an account (for example, your iCloud account).

We certainly don’t want you to risk losing emails from a POP3 account, if they aren’t being stored elsewhere. If you have more than one account set up in the Mail app, does it happen for multiple accounts?

Thanks. 

Then it begs the question ?

What exact version of Ventura is installed on this computer

A Screen Shot of " About this Mac " without the serial number appearing.

Anything less than 13.1 needs to be updated

Links below relevant to this topic

Keep your Mac up to date - Apple Support (CA)

About the security content of macOS Ventura 13.1 - Apple Support (CA)

Mail -> Settings -> General -> Followup suggestions [toggle off]

Well, I have finally seemed to have fixed all of the endless issues I have had with my email. This was one of them and no matter how I tried, and the endless starts and restarts, I finally reached a place where I could not even receive emails on my Mac. Then following instructions because Google app and Chrome kept asking for me to log in with my password, which it would not accept, my Google 2-Step Verification did not work!

I then searched through Google and deleted that security step, and they suggested there that to start fresh, that I delete my Gmail account in my mail app and sign in again. That was the issue. Clean and simple. Now all of the issues I was having with the mail app have disappeared! At least for now!

Sorry but I can not duplicate this issue where using the Default View in Apple Mail or using the " Column View in Mail.

At least on 3 Apple Computer I am using.

2 on Ventura 13.1 and 1 stuck on High Sierra macO 10.13.6

Go figure.

Then have a few suggestions ;

1 - Get Support Choose a product and we’ll find you the best solution.Start now and open an Apple Support Ticket as they are Apple Employees to deal will these types of issues . 

2 - Product Feedback - Apple and make it known to Apple regarding this ongoing issue 

I'm running Mail, Version 16.0 (3774.500.171.1.1) on a M2 14" MacBook Pro, running Sonoma 14.4. I too began to experience this behaviour, maybe in 14.2 (?). Storing read mails in local folders, then various messages randomly re-appearing in the inbox (deleted messages as well). I have "Follow up suggestions" un-ticked, yet the behaviour persists. Trying various options in the "Mailbox behaviours" in the Accounts tab of Mail's preferences have no affect. It's so random and frustrating I have no idea what to do. Anyway, I don't think there is a solution. (?) I'm beginning to believe that Sonoma is so bug-heavy it is Apple's answer to Windows Vista.

thanks,

Michael

Is the User using the " Sort By Conversation " Feature ?

Has the User used the " Sort By " feature with Sort Oldest First versus Newest First ?

I have the same issue. Filters do not help. This started with the 13.1 update. It makes my inbox unmanageable.