anchor.diff:  
   
   | `isis.services.` +
  -`eventbus.implementation` +
  +`eventbus.` +
  +`implementation` +
   | `guava`, `axon`, +
   FQCN (`_guava_`)
   |which implementation to use by the xref:rgsvc.adoc#_rgsvc_api_EventBusService[`EventBusService`] as the underlying event bus.
   
   | `isis.services.` +
  -`eventbus.allowLateRegistration` +
  +`eventbus.` +
  +`allowLateRegistration` +
   |`true`,`false` +
   (`false`)
   |whether a domain service can register with the xref:rgsvc.adoc#_rgsvc_api_EventBusService[`EventBusService`] after any events have posted. +
  
positive.code: 
  
  | `isis.service.` +
  `email.port` +
  | port number (`_587_`)
  |The port number for the SMTP service on the the external SMTP host (used by xref:rgsvc.adoc#_rgsvc_api_EmailService[`EmailService`]).  +
  
  
negative.code: 
  
  | `isis.service.` +
  `email.` +
  `sender.hostname` +
  | host (`_smtp.gmail.com_`)
  |The hostname of the external SMTP provider (used by xref:rgsvc.adoc#_rgsvc_api_EmailService[`EmailService`]).  +
  
  