A known problem that is fixed in newer versions.Andre Klapperak-47@gmx.net
Creative Commons Share Alike 3.0
Message fonts are not the same fonts as in other applications
It can happen that EditPreferencesMail PreferencesMessage FontsUse the same fonts as other applications is enabled but Evolution still uses different fonts than other parts of the system.
This bug is fixed in Evolution versions higher than 3.0.2 (stable series) and 3.1.3 (unstable development series). If this is not the case, please add a comment to the corresponding bug report.