Add a helper function for checking if an email is attributable
Add a helper function for checking if an email is attributable

j-f1/forked-desktop,shiftkey/desktop,desktop/desktop,shiftkey/desktop,desktop/desktop,shiftkey/desktop,j-f1/forked-desktop,j-f1/forked-desktop,j-f1/forked-desktop,desktop/desktop,shiftkey/desktop,desktop/desktop