The crash I've been seeing even on the MailKit sample app:
Process: Mail [2744]
Path: /System/Applications/Mail.app/Contents/MacOS/Mail
Identifier: com.apple.mail
Version: 16.0 (3731.700.6)
Build Info: Mail_App-3731700006000000~4
Code Type: X86-64 (Native)
Parent Process: launchd [1]
User ID: 501
Date/Time: 2023-07-27 12:14:13.0114 +0200
OS Version: macOS 13.5 (22G74)
Report Version: 12
Bridge OS Version: 7.6 (20P6072)
Anonymous UUID: B6039EA8-CA31-5C41-EE33-6E114E55702D
Time Awake Since Boot: 620 seconds
System Integrity Protection: enabled
Crashed Thread: 4 Dispatch queue: IMAPNetworkTaskHandler queue (QOS: BACKGROUND)
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Termination Reason: Namespace SIGNAL, Code 6 Abort trap: 6
Terminating Process: Mail [2744]
Application Specific Information:
abort() called
Does yours have a similar crash on the IMAPNetworkTaskHandler queue?
apparition
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Yep, you can parse out the attachments from the MIME data but for the decodedMessage(forMessageData:) function, Apple still leaves it to you to rebuild the whole RFC822 message. In my case where I need to edit the text/html MIME data, I need to pull out the text/html then rebuild the entire RFC 822 to return to decodedMessage(forMessageData:).
Michael Tsai from SpamSieve wrote some thoughts about MailKit: https://mjtsai.com/blog/2021/06/23/mail-app-extensions/
If you want to see what functionalities MailKit offers, best to checkout Apple's sample app with Mail Extensions: https://developer.apple.com/documentation/mailkit/build_mail_app_extensions
I was having crash-on-start issues too but it doesn't seem to be consistently reproducible [macOS Ventura 13.4.1 (c) (22F770820d), Mail Version 16.0 (3731.600.7)]
Correction to the above, context isn't nil. It's empty (context.isEmpty == true). Why?
Still seems to be an issue on Xcode and iOS beta 5