New enhancements and features made in v2.4.x:

• Incoming emails support. As for now only clear text is fully supported. Rich text (with embedded images, or containing additional text markers and formatting) that is usually sent with HTML email format is not supported yet and thus highly not recommended (unforeseen result can happen when doing so);
• new configuration view for a project, enabling a possibility to set, if any newly-sent email is to be threaded, or not (Emails tab);
• additional preview for all unsuccessfully sent emails;
• added possibility to re-send any failed email;
• minor user interface improvements, towards making it more polished.