Version:           1.10.4 (using 4.1.4 (KDE 4.1.4), Mandriva Linux release 2009.0 (Official) for i586)
Compiler:          gcc
OS:                Linux (i686) release 2.6.27.19-desktop-1mnb

Often when trying to send a website link from the konqueror File menu ("Send link address") kmail will hang, particularly (it seems) with multiple recipients (To, and multiple CCs) designated.  I have now found that it also has trouble sending to multiple recipients, as above, when sending from directly within kmail.  
	I attempted to send a set of 4 jpeg pics to multiple recipients twice and in each case, upon hitting send, kmail hung with for an indefinite period of time before I finally had to close the email window by hitting "X" (the kill button) in the window frame.  After 5 seconds, the message comes up that kmail is not responding and do I want to continue or terminate the app.  There are no obvious error messages produced, and no core, but here is what appears to be relevant entries in my .xsession-errors file coincident with the hang and the resulting requirement to kill kontact/kmail:

plasma(5144) KConfigGroup::readXdgListEntry: List entry Categories in "/usr/share/applications/kde4/Kontact.desktop" is not compliant with XDG standard (missing trailing semicolon).                                                                          
klauncher(5126) KConfigGroup::readXdgListEntry: List entry Categories in "/usr/share/applications/kde4/Kontact.desktop" is not compliant with XDG standard (missing trailing semicolon).                                                                       
kdeinit4: preparing to launch /usr/bin/kontact
"/usr/bin/kontact(22130)" Error in thread 3030898384 : "org.freedesktop.DBus.Error.ServiceUnknown - The name org.kde.nepomuk.services.nepomukstorage was not provided by any .service files"
"/usr/bin/kontact(22130)" Error in thread 3030898384 : "QLocalSocket::connectToServer: Invalid name"
Enchant dict for "en_US" 0x92217c8
kwin: X Error (error: <unknown>[DAMAGE+0], request: XDamageDestroy[DAMAGE+2], resource: 0x1607c08)
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  20
  Minor opcode:  0
  Resource id:  0x5e03128
Enchant dict for "en_US" 0x92217c8
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  20
  Minor opcode:  0
  Resource id:  0x5e00075