Email Transport
URI format: mailto://username@domain
Example: mailto://john@acme.com
When using Email transport, you have the option of specifying the mail subject. If the subject contains the string
operationID="category/version_number/operation_name"
then OperationID is taken as the operation ID for that transaction.
If the operation ID is not specified in the subject, then the value is what is sent by the private process.