Affected Version: 2.11.5-37-ga5f2037
What steps will reproduce the problem?
1. Configure user settings to not 'CC me on comments i write'
2. trigger email from user
3. observe that From header is not present on email.
I have proposed a solution to this here (in case this is indeed an accepted bug):
One reason why this is causing problems is that signing emails with DKIM requires a From header to be present. Toggling the cc option to on solves this problem as the header will not be stripped away but it is untuitive and feels buggy that this is controlled by an option about cc-ing behavior.