diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.desc.xml b/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.desc.xml
index 0e9eb6e420..efe1d0deb9 100644
--- a/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.desc.xml
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.desc.xml
@@ -1,10 +1,11 @@
 <webscript>
    <shortname>IMAP Workflow Handler</shortname>
    <description>
-      This webscript starts a different workflow. It is used in the IMAP email body links.
+      This webscript starts a different workflow. It is used in the IMAP email body links. The workflowType should be a fully-qualified worklfow-definition name, with 
+      engine-name included. eg: activiti$activitiAdhoc. If engine-name is left out, JBPM is used as engine-name for the process.
       (The optional feature is the reply email with a report.)
    </description>
-   <url>/imap/start-workflow?alfTicket={ticket}&amp;nodeRefId={id}&amp;workflowType={wt}&amp;assignTo={at}&amp;workflowDueDateDay={ddd}&amp;workflowDueDateMonth={ddm}&amp;workflowDueDateYear={ddy}&amp;description={desc}</url>
+   <url>/imap/start-workflow?alfTicket={ticket}&amp;nodeRefId={id}&amp;workflowType={wt}&amp;assignTo={at}&amp;workflowDueDateDay={ddd}&amp;workflowDueDateMonth={ddm}&amp;workflowDueDateYear={ddy}&amp;description={desc}&amp;workflowPriority={wp?}</url>
    <format default="html">extension</format>
    <authentication>user</authentication>
    <transaction>required</transaction>
diff --git a/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.js b/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.js
index c55922ffaf..57f9defe60 100644
--- a/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.js
+++ b/config/alfresco/templates/webscripts/org/alfresco/repository/imap/start-workflow.get.js
@@ -9,7 +9,13 @@ function main()
       status.redirect = true;
       return;
    }      
-    var workflowType = "jbpm$wf:" + args.workflowType;
+   
+    // ALF-13898: accept FULL workflow-definition name if provided, otherwise revert to prefixing behavior
+    var workflowType = args.workflowType;
+    if(workflowType.indexOf('$') < 0) {
+       workflowType = "jbpm$wf:" + workflowType;
+    }
+    
     var assignTo = people.getPerson(args.assignTo);
     if (assignTo == undefined)
     {
@@ -32,7 +38,12 @@ function main()
     workflow.parameters.workflowName = workflowType;
     workflow.parameters["bpm:workflowDescription"] = description;
     workflow.parameters["bpm:assignee"] = assignTo;
-    workflow.parameters["bpm:workflowPriority"] = args.workflowPriority;
+    
+    if (args.workflowPriority != null)
+    {
+       workflow.parameters["bpm:workflowPriority"] = args.workflowPriority;
+    }
+    
     if (dueDate != null)
     {
        workflow.parameters["bpm:workflowDueDate"] = dueDate;