diff -r 87328572e36f -r c8e1b5282f69 src/main/webapp/WEB-INF/jsp/issue-view.jsp
--- a/src/main/webapp/WEB-INF/jsp/issue-view.jsp	Wed Aug 18 14:57:45 2021 +0200
+++ b/src/main/webapp/WEB-INF/jsp/issue-view.jsp	Wed Aug 18 15:04:59 2021 +0200
@@ -130,7 +130,14 @@
         <th><fmt:message key="issue.assignee"/></th>
         <td>
             <c:if test="${not empty issue.assignee}">
+                <c:if test="${not empty issue.assignee.mail}">
+                <a href="mailto:<c:out value="${issue.assignee.mail}"/>">
+                    <c:out value="${issue.assignee.displayname}"/>
+                </a>
+                </c:if>
+                <c:if test="${empty issue.assignee.mail}">
                 <c:out value="${issue.assignee.displayname}"/>
+                </c:if>
             </c:if>
             <c:if test="${empty issue.assignee}">
                 <fmt:message key="placeholder.null-assignee" />