#define MODEST_HEADER_ICON_ATTACH "email_attachment"
#define MODEST_HEADER_ICON_HIGH "email_message_high_priority"
#define MODEST_HEADER_ICON_LOW "email_message_low_priority"
+#define MODEST_HEADER_ICON_CALENDAR "email_event_invitation"
/*
* until we have the custom cell renderer, we use the hacked icons below;