Trying to send a couple messages evolution will get stuck at Sending (0%). 
Short messages get right through, even medium messages, and this one isn't all
that long.  Here is a backtrace when Evo is stuck:

Thread 2 (Thread 0x403b3950 (LWP 3112)):
#0  0x00007f9bb8f6f346 in __poll (fds=0x2552460, nfds=8, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9bb923eaf8 in g_main_context_iterate (context=0x251a4f0, block=1, 
    dispatch=1, self=<value optimized out>) at gmain.c:2945
#2  0x00007f9bb923f18d in IA__g_main_loop_run (loop=0x2518800) at gmain.c:2844
#3  0x00007f9bbbc1edf0 in link_io_thread_fn (data=<value optimized out>)
    at linc.c:396
#4  0x00007f9bb9264404 in g_thread_create_proxy (data=0x24eade0)
    at gthread.c:635
#5  0x0000000002bc740a in start_thread (arg=<value optimized out>)
    at pthread_create.c:297
#6  0x00007f9bb8f78d1d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f9bb22657b0 (LWP 3111)):
#0  0x00007f9bb8f6f346 in __poll (fds=0x2551140, nfds=5, timeout=1195629)
    at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9bb923eaf8 in g_main_context_iterate (context=0x24dd3c0, block=1, 
    dispatch=1, self=<value optimized out>) at gmain.c:2945
#2  0x00007f9bb923f18d in IA__g_main_loop_run (loop=0x24b8950) at gmain.c:2844
#3  0x00007f9bbc08e276 in bonobo_main () at bonobo-main.c:311
#4  0x0000000000415542 in main (argc=3, argv=<value optimized out>)
    at notify-main.c:164
0x00007f9bb8f6f346	87	  int result = INLINE_SYSCALL (poll, 3, CHECK_N (fds,
nfds), nfds, timeout);

or a more full bt:

Thread 2 (Thread 0x403b3950 (LWP 3112)):
#0  0x00007f9bb8f6f346 in __poll (fds=0x2552460, nfds=8, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:87
	oldtype = 0
	result = <value optimized out>
#1  0x00007f9bb923eaf8 in g_main_context_iterate (context=0x251a4f0, block=1, 
    dispatch=1, self=<value optimized out>) at gmain.c:2945
	max_priority = 2147483647
	timeout = -1
	some_ready = <value optimized out>
	nfds = 8
	allocated_nfds = <value optimized out>
	fds = (GPollFD *) 0x2552460
	__PRETTY_FUNCTION__ = "g_main_context_iterate"
#2  0x00007f9bb923f18d in IA__g_main_loop_run (loop=0x2518800) at gmain.c:2844
	self = (GThread *) 0x24eade0
	__PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#3  0x00007f9bbbc1edf0 in link_io_thread_fn (data=<value optimized out>)
    at linc.c:396
No locals.
#4  0x00007f9bb9264404 in g_thread_create_proxy (data=0x24eade0)
    at gthread.c:635
	__PRETTY_FUNCTION__ = "g_thread_create_proxy"
#5  0x0000000002bc740a in start_thread (arg=<value optimized out>)
    at pthread_create.c:297
	__res = <value optimized out>
	pd = (struct pthread *) 0x403b3950
	unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 39983758213120708, 0, 
        3338240, 0, 140736509208800, 40124968697332420, 39978778829914820}, 
      mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {
      prev = 0x0, cleanup = 0x0, canceltype = 0}}}
	not_first_call = <value optimized out>
	robust = <value optimized out>
#6  0x00007f9bb8f78d1d in clone () from /lib64/libc.so.6
	__elf_set___libc_subfreeres_element_fstab_free__ = (
    const void *) 0x7f9bb8fb5dc0
	fstab_state = {fs_fp = 0x0, fs_buffer = 0x0, fs_mntres = {
    mnt_fsname = 0x0, mnt_dir = 0x0, mnt_type = 0x0, mnt_opts = 0x0, 
    mnt_freq = 0, mnt_passno = 0}, fs_ret = {fs_spec = 0x0, fs_file = 0x0, 
    fs_vfstype = 0x0, fs_mntops = 0x0, fs_type = 0x0, fs_freq = 0, 
    fs_passno = 0}}

Thread 1 (Thread 0x7f9bb22657b0 (LWP 3111)):
#0  0x00007f9bb8f6f346 in __poll (fds=0x2551140, nfds=5, timeout=1195629)
    at ../sysdeps/unix/sysv/linux/poll.c:87
	oldtype = 0
	result = <value optimized out>
#1  0x00007f9bb923eaf8 in g_main_context_iterate (context=0x24dd3c0, block=1, 
    dispatch=1, self=<value optimized out>) at gmain.c:2945
	max_priority = 2147483647
	timeout = 1195629
	some_ready = <value optimized out>
	nfds = 5
	allocated_nfds = <value optimized out>
	fds = (GPollFD *) 0x2551140
	__PRETTY_FUNCTION__ = "g_main_context_iterate"
#2  0x00007f9bb923f18d in IA__g_main_loop_run (loop=0x24b8950) at gmain.c:2844
	self = (GThread *) 0x24a7630
	__PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#3  0x00007f9bbc08e276 in bonobo_main () at bonobo-main.c:311
	loop = (GMainLoop *) 0x5
#4  0x0000000000415542 in main (argc=3, argv=<value optimized out>)
    at notify-main.c:164
No locals.
0x00007f9bb8f6f346	87	  int result = INLINE_SYSCALL (poll, 3, CHECK_N (fds,
nfds), nfds, timeout);

The text of the message is:

Per the Fedora 9 Development schedule, we will begin allowing early CVS
branching of packages for F-9.  This will allow maintainers to have an
F-9/ branch for continued Fedora 9 stable work and allow experimental
work to happen in the devel/ branch.  For packages that choose to
branch, builds from devel/ will be held in the 'dist-f10' collection
within koji.  Builds from F-9/ will go to the dist-f9 collection and
show up in rawhide (at least until the final freeze).

Maintainers that wish to have their packages branched early will need to
use the standard CVS Request method
( http://fedoraproject.org/wiki/PackageMaintainers/CVSAdminProcedure ).
We will begin processing these requests on Tuesday, March 25th.

New packages brought into Fedora will not automatically get an F-9 tag
until after the mass branch date, which coincides with the final freeze
date.

-- 
Jesse Keating
Fedora -- All my bits are free, are yours?