Problem:
SourceTree started to use my private Atlassian registration mail address to mark commit to used git server. The behavior started without a manual configuration change.

Checked:

1. The configured user name and mail address in global git configuration is still the currect address. The project configuration uses the switch "Use global user settings" and display the global correct value.
2. I opened a long time unused project and pulled the current state from master. The log shows the switch from the configured mail address to the mail address from the license.
3. I checked the windows profile APPDATA directory and the wrong used mail address is part of the sourcetree.license and accounts.json only. No other reference can be found. (Accounts.json shows mail address in user name field and mail address field is empty while the license shows correct name and mail address).

Question:
Is this a source tree issue? I did not find any configuration which references the wrong mail address for commits.