Feature Request – Header Cleanup

Nobody has claimed this yet.

I confirm I have upgraded to the latest GYB release from https://github.com/jay0lee/got-your-back/releases and I still have this issue. I confirm I am typing the command as described in the GAM Wiki at https://github.com/jay0lee/got-your-back/wiki

**Full steps to reproduce the issue:**

1. Export Inbox:
_gyb --email abc@xyz.com --service-account --action backup_
2. Restore Inbox to another account:
_gyb --email archive@xyz.com --action restore --local-folder "C:\GAMADV-XTD3\GYB-GMail-Backup-abc@xyz.com" --service-account --label-prefix "ABC's Emails"_

**Expected outcome (what are you trying to do?):**
Restore ABC's emails to archive@xyz.com

**Actual outcome (what errors or bad behavior do you see instead?):**
> _restoring 15 messages (74/28498)
> ERROR: 400: Expected a single 'From' header. Skipping message restore.
> ERROR: 400: Expected a single 'From' header. Skipping message restore.
> restoring 17.1mb message (75/28498)_

**A Header Cleanup feature would be greatly appreciated!**

Start by reproducing the restore with the documented gyb backup and restore commands, using the sample accounts and label prefix in this issue. Investigate how GYB handles messages that produce “Expected a single 'From' header.” Done should include a defined header-cleanup behavior and successful restoration of affected messages without those errors.

Written by the indexing model from the issue text.