LittleBITS: Unsubscribe Bug Reversed and Virtualizing Monterey on an Old Mac

My brother has an iMac 2015 running Catalina and cannot but upgraded to Big Sur.

His TurboTax program issued a warning that next year’s 2022 version (for a 2021 tax return) will not run on this machine.

Two questions:

  • how could TurboTax determine the machine version (or, is it using the macOS software-hardware eligibility sheet)?
  • if VmWare Fusion and Monterey were installed, would TurboTax “think” differently?


I have Monterey and Big Sur running on an SSD-equipped mid-2012 i7 MacBook Pro with 16 GB RAM. The host environment is Mojave 10.14.6. I have separate Big Sur VMs running on that system under Parallels 17 and VMware Fusion 11.5.7, and I have Monterey running under Parallels. I didn’t bother to install Monterey under VMware.

These VMs are surprisingly usable on this hardware, but really only for testing purposes and for exploring basic Big Sur/Monterey features. They run things like Safari and BBEdit reasonably well, but they’re just a little too slow on this hardware for normal, everyday use.

However, if you your Mac has a traditional spinning hard drive, I wouldn’t even try to virtualize Big Sur or Monterey, especially on older hardware.

FWIW, Windows 10 works very well on this particular machine, both as a VM and via Boot Camp.

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The warning is about Catalina, not his machine version. His iMac is fully capable of running Big Sur (according to MacTracker), so all he needs to do is upgrade macOS by this time next year.

Just to be clear, the free product is called VMware Fusion Player which mine currently is at 12.1.0 and this is a different product from the previous ones. There is some confusion on their help boards regarding “upgrades” from other versions such as for those who have Mojave and can’t run this free product.

The free product is VMware Fusion Player and is at 12.1.0 on my mac so whether it is any better than the VMware Fusion 11.5.7 version, I can’t say with certainty although I have tried the one you’re using and it worked fairly well under Mojave. SSD’s are certainly better but spinning drives can be used as long as you don’t mind the slowness with some programs.

I am running VMWare Fusion 7.1.3 (and have a license for v8; never installed) and it works just fine in Mojave – so I’ll keep using that. My only VMs are Snow Leopard Server and Windows XP Pro.

I recall trying some older versions in the past using a trial period but things ran too slow but at that time, I didn’t have any SSD’s so that was a main issue. With Windows and Boot Camp, it was similar. However, the free version works well under Catalina to run an old Windows 7 VM which I rarely use and the Monterey VM so for me, it works fine.

I still have my Mojave partition so I just boot into it if needed as well as some other old OS versions.

I’m not unsubscribed, but I did get a notice this morning when I visited the site (after seeing no email since last night, which is unusual) that you cannot reach my email address.

My email address has definitely not changed (it is a gmail address) and I’m receiving mail just fine. Is this some sort of bug on your end?

I got the same message from the TidBITS-Talk system. My delivery is also to Google-hosted email but the address is a custom domain on a G Suite account (it’s not the “true” email address for the account, but an alias).

By the way, after posting the above I was able to fix this by changing my email address to one with a”+tidbits” after my username and before the @gmail dot com.

Thanks, guys! I’m not sure what’s happening yet, but I’ll see if I can figure it out. Some days I really hate email. :slight_smile:

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Alright, I don’t know what happened, but a whole lot of primarily Gmail users bounced. I’ve reset everyone who did, so we’ll see if it happens again.

I send out a neighborhood newsletter using a Mac bulk email program and I noticed several months ago that some email servers on .gov and .edu domains are using some kind of link checking program which shows that they have clicked on every link in the email. Including unsubscribe links! Perhaps this is also what is happening with your emails.


Interesting. This seems to be the case in some institutions where external URLs are redirected through some form of filters (e.g. TrendMicro) to detect phishing attempts.

There were some discussions online about accidental unsubscribes. Some suggested implementing a manual click-to-unsubscribe at a webpage instead of one-click unsubscribe.

Microsoft mentions activation of links in a sandbox environment for threat-detection purposes.

Attachments or links in the email are opened inside a sandbox environment where the content is analyzed by our machine learning models that check for malicious signals and apply deep link inspection, allowing for zero-day malicious attachments and links to be detected


Thanks for that, @chengengaun. I hadn’t heard about this before, but I could see it accounting for our weird spate of unsubscribes. Perhaps there was something else in that issue that elevated it in the mind of some anti-spam checker. Although our visible Unsubscribe link actually takes people to their profile, there is a List-Unsubscribe header that Sendy adds for instant unsubscribes that don’t go back through WordPress.


It turns out that Sendy has a feature to prevent just this problem from happening, and I’ve now turned it on for all of our lists. The developer’s response to my report:

As part of email marketing’s best practice, Sendy includes a List-unsubscribe header in each email sent. This List-unsubscribe header contains the unsubscribe link unique for each recipient and is used by email clients to display a native ‘Unsubscribe’ link at the top of the message if they choose to. Gmail for example displays a native unsubscribe link at the top of an email they think is a newsletter:

The unsubscribe link points to the unsubscribe URL found in the List-unsubscribe header.

Some ISPs use this List-unsubscribe header data to automatically unsubscribe a user when they think the email is spam. For example, corporate email servers are known to unsubscribe users with this data when they think the email is not important even before your email reaches the recipient. How email clients or ISPs use the List-unsubscribe header is out of anyone’s control.

The solution is to set your list’s ‘Unsubscribe setting’ to ‘Double opt-out’ so that another confirmation link needs to be clicked by the recipient in the unsubscribe page before they are being unsubscribed from the list.


I’m impressed with Sendy – they seem very responsible in terms of keeping to email standards in a sensible way!

Thx Al, I figured it was something simple like that.

I misspoke about the 2015 iMac. It’s a 2005 and is no longer eligible for updates beyond Catalina. We tried the Software update and confirmed it with this link from Apple. {Mac OS Compatibility Guide by Mac Model
This link might be useful to those with older Macs to check when macOS support is deprecated.}

Why would Google automatically unsubscribing us from a mailing list cause Discourse to send us an in-system message saying email to our addresses was bouncing?

I think the 200-person unsubscribe that happened on December 6th was completely separate from Discourse’s bounce hiccup that was last week. Or at least it better have been! :slight_smile: