diff --git a/src/main/java/org/support/project/knowledge/control/admin/UsersControl.java b/src/main/java/org/support/project/knowledge/control/admin/UsersControl.java
index 124343514..e636538c2 100644
--- a/src/main/java/org/support/project/knowledge/control/admin/UsersControl.java
+++ b/src/main/java/org/support/project/knowledge/control/admin/UsersControl.java
@@ -10,6 +10,8 @@
 import org.support.project.common.util.StringUtils;
 import org.support.project.di.DI;
 import org.support.project.di.Instance;
+import org.support.project.knowledge.config.AppConfig;
+import org.support.project.knowledge.config.SystemConfig;
 import org.support.project.knowledge.control.Control;
 import org.support.project.knowledge.logic.MailLogic;
 import org.support.project.knowledge.logic.UserLogicEx;
@@ -22,9 +24,11 @@
 import org.support.project.web.control.service.Post;
 import org.support.project.web.dao.ProvisionalRegistrationsDao;
 import org.support.project.web.dao.RolesDao;
+import org.support.project.web.dao.SystemConfigsDao;
 import org.support.project.web.dao.UsersDao;
 import org.support.project.web.entity.ProvisionalRegistrationsEntity;
 import org.support.project.web.entity.RolesEntity;
+import org.support.project.web.entity.SystemConfigsEntity;
 import org.support.project.web.entity.UsersEntity;
 import org.support.project.web.exception.InvalidParamException;
 
@@ -355,8 +359,14 @@ public Boundary accept() {
             addMsgSuccess("message.success.accept");
 
             // 承認されたことを通知
+            SystemConfigsEntity config = SystemConfigsDao.get().selectOnKey(SystemConfig.SYSTEM_URL, AppConfig.get().getSystemName());
+            String url;
+            if (config == null) {
+                url = HttpUtil.getContextUrl(getRequest());
+            } else {
+                url = config.getConfigValue();
+            }
             MailLogic mailLogic = MailLogic.get();
-            String url = HttpUtil.getContextUrl(getRequest());
             mailLogic.sendAcceptedAddRequest(entity, url);
         } else {
             // 他の管理者がすでに承認していました
diff --git a/src/main/java/org/support/project/knowledge/control/open/SignupControl.java b/src/main/java/org/support/project/knowledge/control/open/SignupControl.java
index 5af0ff2ec..7fb8e8ddf 100644
--- a/src/main/java/org/support/project/knowledge/control/open/SignupControl.java
+++ b/src/main/java/org/support/project/knowledge/control/open/SignupControl.java
@@ -95,7 +95,13 @@ public Boundary save() {
             // 仮登録を行う
             ProvisionalRegistrationsEntity entity = addProvisionalRegistration();
             // 招待のメールを送信
-            String url = HttpUtil.getContextUrl(getRequest());
+            SystemConfigsEntity config = SystemConfigsDao.get().selectOnKey(SystemConfig.SYSTEM_URL, AppConfig.get().getSystemName());
+            String url;
+            if (config == null) {
+                url = HttpUtil.getContextUrl(getRequest());
+            } else {
+                url = config.getConfigValue();
+            }
             MailLogic mailLogic = MailLogic.get();
             mailLogic.sendInvitation(entity, url, HttpUtil.getLocale(getRequest()));
             return forward("mail_sended.jsp");