Does macOS Monterey limit the number of messages available in Mail?

I had this same problem with an AOL account in early February. Suddenly, a few days later, it resolved itself (mostly...for some reason 7 emails remained missing). It was fine until today, when suddenly they disappeared again and my count was once again limited to 9,999. I've also tried out other email clients (e.g. Spark) and they worked fine. So it's clearly not a Yahoo issue nor an AOL issue. It's something in Mac Mail, and none of the support people had any clue about it when I talked to AppleCare.

That's frustrating that they are unaware of the mail issue, because it definitely exists. I have had exactly the same problem for the last few weeks. I'm still on Catalina 10.15.7 for workflow reasons, but in the last few weeks my Mail app has been limiting the Inbox to 9,999 and ignoring any emails before early Jan 2021. I've tried a rebuild, disengaging and reengaging the account, which is a yahoo.mail account. Nothing works. I can access all of my historic emails logging into yahoo mail through a browser, and I can even use the Mail app search or spotlight search to find emails beyond the inbox limit. But I can't browse through the inbox beyond the 9,999 limit.

There has to be a common reason here. Surely we can't be the only users affected?

The other weird thing in my case is that it doesn't happen on all accounts. I have a Gmail account that it allows to have way more than 9,999, but it seems to limit Yahoo and AOL accounts, among others.

Still found no solution. I'm on Catalina and haven't updated it since buying the Mac. Mail was working just fine until last few weeks, so it can't be OS related, so must be Yahoo.mail IMAP issue.

I've switched to Spark app now on the MacBook Pro and it shows all my emails back to 2007.

I just loaded the account in question on an old laptop I had access to, and the limits didn't seem to happen on High Sierra. I was still able to load the account completely. And until this behavior started, it worked for me on Catalina. It was the "upgrade" to Big Sur that seemed to start the problem. FWIW, it also appeared on my iphone as well. So for me, it does appear to be OS related, as it doesn't happen on High Sierra.

Another interesting behavior is that it used to limit me to 9,999 message, but at some point that seems to have been changed to 10,000 even.

My Yahoo mail message count just dropped today to 20000 emails max in Catalina - I actually watched it happening as the count dropped. Seems quite close to the problem others are having with Monterey. Perhaps a problem not specific to the OS version. I looked on Yahoo mail directly through the Safari web browser and saw no decrease or loss in email count (it's waaayy bigger than 20000 and had been showing up identically in the Mac mail app forever - reminding me I have a mail management problem of my own to deal with!). Should I too just wait a bit to see if it resolves itself?

Hi Shebler,

I took this all the way up the help desk chain and Apple insists there's nothing wrong with their system and that the problem is with AOL.

I am in the process of switching out of AOL email so I'll let you know if I still have the same problem when I change to Gmail.

Good luck,

Rob

Did anyone figured out to fix this issue...

I have 25000+ mails in yahoo, did all kind of troubleshooting even configured my mail in other Mac. Still it is showing 10000 mails only.

I have tried same on 2015 MacBook Air, 2018 MacBook Pro, latest M1 iMac 24" all with updated macOS. still same.

Yes, search works without scrolling. And when the Badge is enabled in the doc it shows over 56k emails for me.

Worrying though that it was working similarly for you until recently.

Tells me you guys should be sending these complaints to Feedback - Mail - Apple because traditionally this is read by Apple software Developers!