All endpoints accept only POST requests. The requests themselves are serialized as XML, JSON and comprise the entire POST body. The request headers should indicate what content type the request is in. All endpoints accept and return UTF-8 data only.
SOAP can be reached by sending all calls to
http://mail.yahooapis.com/ws/mail/v1.1/soap. Additionally, the WSDL for the
service is available at http://mail.yahooapis.com/ws/mail/v1.1/wsdl.