Why is mac mail crashing after installing sonoma 14?
Mac mail is very slow to download attachments and crashes after sending messages.
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By far the easiest way to cause poor performance, instability, overheating and crashing is to install ANY third-party speeder-uppers, Cleaners, Optimizers, or Virus scanners. or a VPN that you installed yourself.
The idea that a third party, with no special knowledge of the inner workings of MacOS, can somehow find a simple way to protect your computer — that is not already being done by MacOS itself — suggests that the MacOS developers are somehow "holding out on you". That is absurd.
You should remove any and all (other than Apple built-in) virus scanners, speeder uppers, optimizers, cleaners, App deleters or VPN packages you installed yourself, or anything of that ilk.
Third-party file Sync-ers such as DropBox, BackBlaze, OneDrive, or GoogleDrive can ruin performance, but are not inherently dangerous.
Effective defenses against malware and ot… - Apple Community
To determine whether added software is the problem, run in Safe Mode, where no third-party items are loaded.
"Works in Safe Mode, Fails in regular mode" implies, "it's something you added."
Start up your Mac in safe mode - Apple Support