diff --git a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
index b0f2749..8c86bee 100644
--- a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
+++ b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
@@ -43,10 +43,8 @@
 
   private val repositoryHooks = new ListBuffer[RepositoryHook]
   private val issueHooks = new ListBuffer[IssueHook]
-  issueHooks += new gitbucket.core.util.Notifier.IssueHook()
 
   private val pullRequestHooks = new ListBuffer[PullRequestHook]
-  pullRequestHooks += new gitbucket.core.util.Notifier.PullRequestHook()
 
   private val repositoryHeaders = new ListBuffer[(RepositoryInfo, Context) => Option[Html]]
   private val globalMenus = new ListBuffer[(Context) => Option[Link]]
diff --git a/src/main/scala/gitbucket/core/util/Notifier.scala b/src/main/scala/gitbucket/core/util/Notifier.scala
index 3e8d39c..0c7d861 100644
--- a/src/main/scala/gitbucket/core/util/Notifier.scala
+++ b/src/main/scala/gitbucket/core/util/Notifier.scala
@@ -1,10 +1,9 @@
 package gitbucket.core.util
 
-import gitbucket.core.model.{Session, Issue, Account}
+import gitbucket.core.model.{Session, Account}
 import gitbucket.core.model.Profile.profile.blockingApi._
-import gitbucket.core.service.{RepositoryService, AccountService, IssuesService, SystemSettingsService}
+import gitbucket.core.service.SystemSettingsService
 import gitbucket.core.servlet.Database
-import gitbucket.core.view.Markdown
 
 import scala.concurrent._
 import scala.util.{Success, Failure}
@@ -31,125 +30,6 @@
     case settings if (settings.notification && settings.useSMTP) => new Mailer(settings.smtp.get)
     case _ => new MockMailer
   }
-
-
-  // TODO This class is temporary keeping the current feature until Notifications Plugin is available.
-  class IssueHook extends gitbucket.core.plugin.IssueHook
-    with RepositoryService with AccountService with IssuesService {
-
-    override def created(issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message(issue.content getOrElse "", r)(content => s"""
-          |$content<br/>
-          |--<br/>
-          |<a href="${s"${context.baseUrl}/${r.owner}/${r.name}/issues/${issue.issueId}"}">View it on GitBucket</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-    override def addedComment(commentId: Int, content: String, issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message(content, r)(content => s"""
-          |$content<br/>
-          |--<br/>
-          |<a href="${s"${context.baseUrl}/${r.owner}/${r.name}/issues/${issue.issueId}#comment-$commentId"}">View it on GitBucket</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-    override def closed(issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message("close", r)(content => s"""
-          |$content <a href="${s"${context.baseUrl}/${r.owner}/${r.name}/issues/${issue.issueId}"}">#${issue.issueId}</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-    override def reopened(issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message("reopen", r)(content => s"""
-          |$content <a href="${s"${context.baseUrl}/${r.owner}/${r.name}/issues/${issue.issueId}"}">#${issue.issueId}</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-
-    protected def subject(issue: Issue, r: RepositoryService.RepositoryInfo): String =
-      s"[${r.owner}/${r.name}] ${issue.title} (#${issue.issueId})"
-
-    protected def message(content: String, r: RepositoryService.RepositoryInfo)(msg: String => String)(implicit context: Context): String =
-      msg(Markdown.toHtml(
-        markdown         = content,
-        repository       = r,
-        enableWikiLink   = false,
-        enableRefsLink   = true,
-        enableAnchor     = false,
-        enableLineBreaks = false
-      ))
-
-    protected val recipients: Issue => Account => Session => Seq[String] = {
-      issue => loginAccount => implicit session =>
-        (
-          // individual repository's owner
-          issue.userName ::
-          // group members of group repository
-          getGroupMembers(issue.userName).map(_.userName) :::
-          // collaborators
-          getCollaboratorUserNames(issue.userName, issue.repositoryName) :::
-          // participants
-          issue.openedUserName ::
-          getComments(issue.userName, issue.repositoryName, issue.issueId).map(_.commentedUserName)
-        )
-        .distinct
-        .withFilter ( _ != loginAccount.userName )  // the operation in person is excluded
-        .flatMap (
-          getAccountByUserName(_)
-            .filterNot (_.isGroupAccount)
-            .filterNot (LDAPUtil.isDummyMailAddress)
-            .map (_.mailAddress)
-        )
-    }
-  }
-
-  // TODO This class is temporary keeping the current feature until Notifications Plugin is available.
-  class PullRequestHook extends IssueHook with gitbucket.core.plugin.PullRequestHook {
-    override def created(issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      val url = s"${context.baseUrl}/${r.owner}/${r.name}/pull/${issue.issueId}"
-      Notifier().toNotify(
-        subject(issue, r),
-        message(issue.content getOrElse "", r)(content => s"""
-          |$content<hr/>
-          |View, comment on, or merge it at:<br/>
-          |<a href="$url">$url</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-    override def addedComment(commentId: Int, content: String, issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message(content, r)(content => s"""
-          |$content<br/>
-          |--<br/>
-          |<a href="${s"${context.baseUrl}/${r.owner}/${r.name}/pull/${issue.issueId}#comment-$commentId"}">View it on GitBucket</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-
-    override def merged(issue: Issue, r: RepositoryService.RepositoryInfo)(implicit context: Context): Unit = {
-      Notifier().toNotify(
-        subject(issue, r),
-        message("merge", r)(content => s"""
-          |$content <a href="${s"${context.baseUrl}/${r.owner}/${r.name}/pull/${issue.issueId}"}">#${issue.issueId}</a>
-          """.stripMargin)
-      )(recipients(issue))
-    }
-  }
-
 }
 
 class Mailer(private val smtp: Smtp) extends Notifier {