PSA: Apple Mail Bugs Can Lead to Data Loss in macOS Catalina

mailappiconMichael Tsai, the developer of EagleFiler and the SpamSieve plug-in for Apple Mail on Mac, has written a blog post warning macOS users about potential data loss in Mail when upgrading to macOS Catalina 10.15.0 (build 19A583).

According to Tsai, he's heard from several users that updating Mail's data store from Mojave to Catalina sometimes says that it has succeeded, when in fact on closer inspection it turns out that large numbers of messages are incomplete or missing entirely.

In addition, users have reported the loss of message content when moving emails between mailboxes. From Tsai's post:

Moving messages between mailboxes, both via drag-and-drop and AppleScript, can result in a blank message (only headers) on the Mac. If the message was moved to a server mailbox, other devices see the message as deleted. And eventually this syncs back to the first Mac, where the message disappears as well.

Tsai warns that these issues are particularly pernicious because users may not realize anything's wrong unless they look at affected messages or mailboxes. Since the data is synced to the server, these problems can also propagate to other computers and devices, and relying on backups is difficult because Mail data is continually changing and there's no easy way to merge restored data with messages received since the last backup.

Despite the latter risk, it's still good practice to make backups, but Tsai notes that Apple Support appears to be erroneously advising users that lost Mail data in Catalina can't be recovered from a Time Machine backup made using macOS Mojave.

According to Tsai, this is not the case: Apple Mail's File -> Import Mailboxes... menu bar option can be used to selectively import them into Mail in Catalina as new local mailboxes.

Tsai says he's unsure whether these issues are due to Mail bugs or to other factors such as problems on the Mac or with the mail server. Apple released macOS Catalina 10.15.1 beta to developers on Friday, but it's still unclear if this version resolves the Mail app bugs. Regardless, Tsai's advice to users who rely on Apple Mail is to "hold off on updating to Catalina for now."

Affected readers can find the full breakdown of the issues here. Have you had problems with Mail since updating to Catalina? Let us know in the comments below.

Related Forum: macOS Catalina

Top Rated Comments

cardfan Avatar
25 months ago
Looks like Apple has their own windows Vista.
Score: 75 Votes (Like | Disagree)
Apple_Robert Avatar
25 months ago

Who is heading the Mail department? I want him fired.
Newman is the head of the mail department.
Score: 61 Votes (Like | Disagree)
Geert76 Avatar
25 months ago
macOS Catalina is one OS to skip. Never read about so many bugs and other problems with a release of a fresh new macOS.
Score: 54 Votes (Like | Disagree)
Khedron Avatar
25 months ago
Can all the people defending Apple like "it's ok to brick your system it's only beta" now wake up and see Apple has a software development problem that is getting worse and worse
Score: 51 Votes (Like | Disagree)
TrenttonY Avatar
25 months ago
Good thing Apple had a beta to iron these critical bugs out!
oh wait...
Score: 45 Votes (Like | Disagree)
jafd Avatar
25 months ago
One would think a trillion dollar company could afford a QA department with people that are actually competent.
Score: 39 Votes (Like | Disagree)

Top Stories

m1x mac mini screen feature

High-End 'M1X' Mac Mini With New Design and Additional Ports Expected to Launch in the 'Next Several Months'

Sunday August 22, 2021 5:59 am PDT by
Apple can be expected to launch an updated high-end Mac mini with a new design and a faster "M1X" Apple silicon processor in the "next several months," Bloomberg's Mark Gurman reports. In the latest publication of his Power On newsletter, Gurman writes that a new high-end Mac mini, which has previously been reported to feature a new design with additional ports, can be expected to replace...
mac scanner permission error

Apple Says Fix Planned for 'You Do Not Have Permission to Open the Application' Error When Using a Scanner on Mac

Saturday August 14, 2021 6:15 am PDT by
In a newly published support document on its website, Apple has acknowledged an error that some users may receive when they try to use a scanner with a Mac in the Image Capture app, Preview app, or the Printers & Scanners section of System Preferences. A screenshot of the error message from the HP Support Community When attempting to use a scanner with a Mac, Apple said users might get an...
iCloud General Feature

iCloud+'s New Custom Email Domain Feature Now Available in Beta

Wednesday August 25, 2021 7:48 am PDT by
Starting with iOS 15, iPadOS 15, and macOS Monterey, users with a paid iCloud+ storage plan can personalize their iCloud email address with a custom domain name, such as johnny@appleseed.com, and the feature is now available in beta. iCloud+ subscribers interested in setting up a custom email domain can visit the beta.icloud.com website, select "Account Settings" under their name, and select ...
original iphone

Phil Schiller Says iPhone Was 'Earth-Shattering' Ten Years Ago and Remains 'Unmatched' Today

Monday January 9, 2017 7:15 am PST by
To commemorate the tenth anniversary of the iPhone, Apple marketing chief Phil Schiller sat down with tech journalist Steven Levy for a wide-ranging interview about the smartphone's past, present, and future. The report first reflects upon the iPhone's lack of support for third-party apps in its first year. The argument inside Apple was split between whether the iPhone should be a closed...
macbookpro13large

macOS Big Sur Update Bricking Some Older MacBook Pro Models

Sunday November 15, 2020 5:33 am PST by
A large number of late 2013 and mid 2014 13-inch MacBook Pro owners are reporting that the macOS Big Sur update is bricking their machines. A MacRumors forum thread contains a significant number of users reporting the issue, and similar problems are being reported across Reddit and the Apple Support Communities, suggesting the problem is widespread. Users are reporting that during the...
m1 imac orange

New iMac Tidbits: Headphone Jack on Side, Ethernet Port on Power Adapter, Spatial Audio and WiFi 6 Support, No SD Card Slot

Wednesday April 21, 2021 6:38 am PDT by
Apple yesterday announced a completely redesigned 24-inch iMac with the M1 Apple silicon chip. The new iMac, the first major redesign of the Mac desktop computer since 2012, has several changes compared to the previous generation. In the aftermath of the event, a few new features and tidbits may have slipped under the radar, so we’ve compiled this list of some of the less-talked-about...
General YouTube Feature 1

YouTube Premium and Music Surpass 50 Million Subscribers

Friday September 3, 2021 2:19 am PDT by
YouTube says it has passed 50 million subscribers for its Premium and Music subscriptions, making it the "fastest growing music subscription" service in the world, according to YouTube's global head of music, Lyor Cohen. YouTube says that it has more than 50 million paying subscribers collectively across YouTube Premium and YouTube Music. The Google-owned service says it attributes this...
Top Stories 75 Thumbnail

Top Stories: Last-Minute iPhone 13 Rumors, Apple Announces App Store Changes, and More

Saturday September 4, 2021 6:00 am PDT by
The finish line is in sight! Apple's annual iPhone event is likely just a week or so away and all eyes will be on the company as it unveils the next version of its most popular product line. With any luck, we'll also see the next-generation Apple Watch and perhaps even some new AirPods. Other news this week saw Apple making some more changes to its App Store policies in response to a...
omg lightning cable comparison

Security Researcher Develops Lightning Cable With Hidden Chip to Steal Passwords

Thursday September 2, 2021 6:59 am PDT by
A normal-looking Lightning cable that can used to steal data like passwords and send it to a hacker has been developed, Vice reports. The "OMG Cable" compared to Apple's Lightning to USB cable. The "OMG Cable" works exactly like a normal Lightning to USB cable and can log keystrokes from connected Mac keyboards, iPads, and iPhones, and then send this data to a bad actor who could be over a...
studio buds family

Beats Studio Buds Debuting Today With Active Noise Cancellation, Stemless Design, and More for $150

Monday June 14, 2021 8:00 am PDT by
We've seen a lot of teasers about the Beats Studio Buds over the past month since they first showed up in Apple's beta software updates, and today they're finally official. The Beats Studio Buds are available to order today in red, white, and black ahead of a June 24 ship date, and they're priced at $149.99. The Studio Buds are the first Beats-branded earbuds to truly compete with AirPods...