Re-raise the exception that caused sending a message to fail

Ignore-this: 622f52d6912fa71e4097727c39e1c02c

darcs-hash:20130514151749-b22ec-a7295bc2a5887e2410c37db7c8d12b740259b412
Added ItemCollection settings type

Ignore-this: ad33fc941e859c2bbde1bd177e242d3d

darcs-hash:20130518223830-b22ec-e13c147663a210780e2abb7f5804c8827ae9ddc5
Added default URI implementation for contacts

Ignore-this: 862eda5eb423ac2a52fec21d5d1612f9

darcs-hash:20130520112506-b22ec-e86fa61ee586fb3a53ab8fb646e502baf870d163