diff --git a/src/main/java/org/olat/modules/lecture/manager/LectureServiceImpl.java b/src/main/java/org/olat/modules/lecture/manager/LectureServiceImpl.java
index 6c0ad0f5a7b70ca91b4dbbd20ded4c9bac603dae..27197b748392e44e597a11d93afd50d81b4cd839 100644
--- a/src/main/java/org/olat/modules/lecture/manager/LectureServiceImpl.java
+++ b/src/main/java/org/olat/modules/lecture/manager/LectureServiceImpl.java
@@ -22,6 +22,7 @@ package org.olat.modules.lecture.manager;
 
 import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.Collections;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -35,6 +36,7 @@ import java.util.stream.Collectors;
 
 import org.apache.velocity.VelocityContext;
 import org.olat.basesecurity.Group;
+import org.olat.basesecurity.GroupRoles;
 import org.olat.basesecurity.IdentityImpl;
 import org.olat.basesecurity.IdentityRef;
 import org.olat.basesecurity.manager.GroupDAO;
@@ -89,7 +91,9 @@ import org.olat.modules.lecture.ui.ConfigurationHelper;
 import org.olat.modules.lecture.ui.LectureAdminController;
 import org.olat.repository.RepositoryEntry;
 import org.olat.repository.RepositoryEntryRef;
+import org.olat.repository.RepositoryEntryRelationType;
 import org.olat.repository.manager.RepositoryEntryDAO;
+import org.olat.repository.manager.RepositoryEntryRelationDAO;
 import org.olat.user.UserDataDeletable;
 import org.olat.user.UserManager;
 import org.olat.user.propertyhandlers.UserPropertyHandler;
@@ -136,6 +140,8 @@ public class LectureServiceImpl implements LectureService, UserDataDeletable, De
 	@Autowired
 	private LectureBlockReminderDAO lectureBlockReminderDao;
 	@Autowired
+	private RepositoryEntryRelationDAO repositoryEntryRelationDao;
+	@Autowired
 	private LectureParticipantSummaryDAO lectureParticipantSummaryDao;
 	@Autowired
 	private RepositoryEntryLectureConfigurationDAO lectureConfigurationDao;
@@ -665,6 +671,27 @@ public class LectureServiceImpl implements LectureService, UserDataDeletable, De
 		dbInstance.commit();
 		
 		recalculateSummary(lectureBlock.getEntry());
+		dbInstance.commit();
+		
+		//send email
+		sendAutoCloseNotifications(lectureBlock);
+	}
+	
+	private void sendAutoCloseNotifications(LectureBlock lectureBlock) {
+		RepositoryEntry entry = lectureBlock.getEntry();
+		List<Identity> owners = repositoryEntryRelationDao
+				.getMembers(entry, RepositoryEntryRelationType.defaultGroup, GroupRoles.owner.name());
+		List<Identity> teachers = getTeachers(lectureBlock);
+		
+		for(Identity owner:owners) {
+			MailerResult result = sendMail("lecture.autoclose.notification.subject", "lecture.autoclose.notification.body",
+					owner, teachers, lectureBlock);
+			if(result.getReturnCode() == MailerResult.OK) {
+				log.audit("Notification of lecture auto-close: " + lectureBlock.getKey() + " in course: " + entry.getKey());
+			} else {
+				log.error("Notification of lecture auto-close cannot be send: " + lectureBlock.getKey() + " in course: " + entry.getKey());
+			}
+		}
 	}
 
 	@Override
@@ -690,40 +717,56 @@ public class LectureServiceImpl implements LectureService, UserDataDeletable, De
 	}
 	
 	private void sendReminder(Identity teacher, LectureBlock lectureBlock) {
+		MailerResult result = sendMail("lecture.teacher.reminder.subject", "lecture.teacher.reminder.body",
+				teacher, Collections.singletonList(teacher), lectureBlock);
+		String status;
+		List<Identity> failedIdentities = result.getFailedIdentites();
+		if(failedIdentities != null && failedIdentities.contains(teacher)) {
+			status = "error";
+		} else {
+			status = "ok";
+		}
+		
+		lectureBlockReminderDao.createReminder(lectureBlock, teacher, status);
+	}
+	
+	private MailerResult sendMail(String subjectI18nKey, String bodyI18nKey,
+			Identity recipient, List<Identity> teachers, LectureBlock lectureBlock) {
+		
 		RepositoryEntry entry = lectureBlock.getEntry();
-		String language = teacher.getUser().getPreferences().getLanguage();
+		String language = recipient.getUser().getPreferences().getLanguage();
 		Locale locale = i18nManager.getLocaleOrDefault(language);
 		String startDate = Formatter.getInstance(locale).formatDate(lectureBlock.getStartDate());
 		
+		StringBuilder sb = new StringBuilder();
+		if(teachers != null && !teachers.isEmpty()) {
+			for(Identity teacher:teachers) {
+				if(sb.length() > 0) sb.append(",");
+				sb.append(userManager.getUserDisplayName(teacher));
+			}
+		}
+		
 		MailContext context = new MailContextImpl("[RepositoryEntry:" + entry.getKey() + "]");
 		String url = Settings.getServerContextPathURI() + "/url/RepositoryEntry/" + entry.getKey() + "/LectureBlock/" + lectureBlock.getKey();
 		String[] args = new String[]{
-				lectureBlock.getTitle(),					//{0}
+				lectureBlock.getTitle(),						//{0}
 				startDate,									//{1}
 				entry.getDisplayname(),						//{2}
-				url,										//{3}
-				userManager.getUserDisplayName(teacher) 	//{4}	
+				url,											//{3}
+				userManager.getUserDisplayName(recipient), 	//{4} The recipient
+				sb.toString()								//{5} The teachers
 		};
 		
 		Translator trans = Util.createPackageTranslator(LectureAdminController.class, locale);
-		String subject = trans.translate("lecture.teacher.reminder.subject", args);
-		String body = trans.translate("lecture.teacher.reminder.body", args);
+		String subject = trans.translate(subjectI18nKey, args);
+		String body = trans.translate(bodyI18nKey, args);
 
 		LectureReminderTemplate template = new LectureReminderTemplate(subject, body);
 		MailerResult result = new MailerResult();
-		MailBundle bundle = mailManager.makeMailBundle(context, teacher, template, null, null, result);
+		MailBundle bundle = mailManager.makeMailBundle(context, recipient, template, null, null, result);
 		MailerResult sendResult = mailManager.sendMessage(bundle);
 		result.append(sendResult);
-
-		String status;
-		List<Identity> failedIdentities = result.getFailedIdentites();
-		if(failedIdentities != null && failedIdentities.contains(teacher)) {
-			status = "error";
-		} else {
-			status = "ok";
-		}
-		
-		lectureBlockReminderDao.createReminder(lectureBlock, teacher, status);
+		return sendResult;
 	}
 
 	@Override
diff --git a/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_de.properties b/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_de.properties
index 9e857bbeb3b023f2e1f7524167d5fa9591a60648..1cb82e1711ae3b7fb82d48c6e0794c1935dbdedd 100644
--- a/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_de.properties
+++ b/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_de.properties
@@ -98,6 +98,8 @@ lecture.appeal.absence.period=Rekursfrist
 lecture.attendance.rate.default=Absenzenquote global in %
 lecture.authorized.absence.enabled=Entschuldigte Absenzen
 lecture.auto.close.period=Sperrfrist
+lecture.autoclose.notification.subject=Lektionenblock "{0}" autoerledigt
+lecture.autoclose.notification.body=<p>Liebe Kursadministratorin<br>Lieber Kursadministrator</p><p>Wir m\u00F6chten Sie informieren, dass Sie die Absenzen f\u00FCr den im Betreff genannten Lektionenblock automtic erdelgit waren. Mit nachfolgendem Link gelangen Sie direkt zum entsprechenden Lektionenblock\:<br><a href\='{3}'>{3}</a></p>
 lecture.block=Lektionenblock
 lecture.block.comment=Bemerkung
 lecture.block.copied=Lektionenblock wurde erfolgreich kopiert.
diff --git a/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_en.properties b/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_en.properties
index 1154f868c6b9c9a732cf3cadecb869706c7787ac..96877ff6914686c331fb848e3fcd8b1a5572e8b2 100644
--- a/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_en.properties
+++ b/src/main/java/org/olat/modules/lecture/ui/_i18n/LocalStrings_en.properties
@@ -98,6 +98,8 @@ lecture.appeal.absence.period=Appeal absence period in days
 lecture.attendance.rate.default=Attendance quota global in %
 lecture.authorized.absence.enabled=Authorized absences
 lecture.auto.close.period=Auto close period in days
+lecture.autoclose.notification.subject=Lecture block "{0}" autoerledigt
+lecture.autoclose.notification.body=<p>Dear course administrator</p><p>We want inform you that the lecture block was closed automatically. With the following link, you can access the lecture block\:<br><a href\='{3}'>{3}</a></p>
 lecture.block=Lectures block
 lecture.block.comment=Comment
 lecture.block.copied=The lectures block was successfully copied.