Mail crashes on opening

Mail crashes as soon as I open it.

This has only just started hapening.

It even happpens when I have restarted Mac in safe mode.

Macbook Pro with M1 chip running Sequoia 15.1.

I updated to 15.1, but no difference, was still happening before I updated.

This is the abbreviated error message, the full report runs to several pages:

Translated Report (Full Report Below)

-------------------------------------

Process: Mail [1353]

Path: /System/Applications/Mail.app/Contents/MacOS/Mail

Identifier: com.apple.mail

Version: 16.0 (3826.200.121)

Build Info: Mail_App-3826200121000000~68

Code Type: ARM-64 (Native)

Parent Process: launchd [1]

User ID: 501

Date/Time: 2024-11-13 18:46:43.7343 +0000

OS Version: macOS 15.1 (24B83)

Report Version: 12

Anonymous UUID: #######################

Time Awake Since Boot: 440 seconds

System Integrity Protection: enabled

Crashed Thread: 8 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 [1353]

Application Specific Information:

abort() called