Notable improvements expected with the release of Evolution 3.0: Migration of local mail storage from mbox to the faster, more resilient maildir format. Built-in duplicate email detection and removal. Significant memory usage and leak optimizations.
Troubled by duplicate emails in your Evolution inbox? You need the remove-duplicates plugin! It slices, it dices, and it comes complete with its own patch set and Makefile. Currently, upstream is tracking this effort here: GNOME Bug 587011 – evolution-kill-bonobo unable to build remove-duplicates
Evolution accepts whitespace in the hostname field. When sending email, it fails due to invalid hostname. This has now been fixed, thanks to input from Alan Matsuoka. Reference: GNOME Bug 533465 – Evolution account editor accepts white space in host name as valid