diff --git a/dev/Stores/User/Settings.js b/dev/Stores/User/Settings.js
index 6b6fe722e..2cdc49d23 100644
--- a/dev/Stores/User/Settings.js
+++ b/dev/Stores/User/Settings.js
@@ -11,7 +11,7 @@ export const SettingsUserStore = new class {
 		const self = this;
 
 		self.messagesPerPage = ko.observable(25).extend({ debounce: 999 });
-		self.checkMailInterval = ko.observable(5).extend({ debounce: 999 });
+		self.checkMailInterval = ko.observable(15).extend({ debounce: 999 });
 		self.messageReadDelay = ko.observable(5).extend({ debounce: 999 });
 
 		addObservablesTo(self, {
diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions.php
index 7618b0cd6..243f122bd 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions.php
@@ -712,7 +712,7 @@ class Actions
 					'HideDeleted' => true,
 					'ShowUnreadCount' => false,
 					'UnhideKolabFolders' => false,
-					'CheckMailInterval' => 5,
+					'CheckMailInterval' => 15,
 					'UserBackgroundName' => '',
 					'UserBackgroundHash' => '',
 					'SieveAllowFileintoInbox' => (bool)$oConfig->Get('labs', 'sieve_allow_fileinto_inbox', false)
diff --git a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Accounts.php b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Accounts.php
index b9669be07..40766ffb9 100644
--- a/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Accounts.php
+++ b/snappymail/v/0.0.0/app/libraries/RainLoop/Actions/Accounts.php
@@ -220,7 +220,7 @@ trait Accounts
 				$aResult['HideDeleted'] = (bool) $oSettingsLocal->GetConf('HideDeleted', true);
 				$aResult['ShowUnreadCount'] = (bool) $oSettingsLocal->GetConf('ShowUnreadCount', false);
 				$aResult['UnhideKolabFolders'] = (bool) $oSettingsLocal->GetConf('UnhideKolabFolders', false);
-				$aResult['CheckMailInterval'] = (int) $oSettingsLocal->GetConf('CheckMailInterval', 5);
+				$aResult['CheckMailInterval'] = (int) $oSettingsLocal->GetConf('CheckMailInterval', 15);
 			}
 //			$this->Plugins()->InitAppData($bAdmin, $aResult, $oAccount);