diff --git a/data/web/edit.php b/data/web/edit.php
index 11c924b5..b53e1794 100644
--- a/data/web/edit.php
+++ b/data/web/edit.php
@@ -705,7 +705,7 @@ if (isset($_SESSION['mailcow_cc_role'])) {
             <div class="form-group">
               <label class="control-label col-sm-2" for="mins_interval"><?=$lang['edit']['mins_interval'];?></label>
               <div class="col-sm-10">
-                <input type="number" class="form-control" name="mins_interval" min="10" max="3600" value="<?=htmlspecialchars($result['mins_interval'], ENT_QUOTES, 'UTF-8');?>" required>
+                <input type="number" class="form-control" name="mins_interval" min="1" max="3600" value="<?=htmlspecialchars($result['mins_interval'], ENT_QUOTES, 'UTF-8');?>" required>
               </div>
             </div>
             <div class="form-group">
diff --git a/data/web/inc/functions.mailbox.inc.php b/data/web/inc/functions.mailbox.inc.php
index 56fe167c..dac60364 100644
--- a/data/web/inc/functions.mailbox.inc.php
+++ b/data/web/inc/functions.mailbox.inc.php
@@ -238,7 +238,7 @@ function mailbox($_action, $_type, $_data = null, $attr = null) {
             );
             return false;
           }
-          if (!filter_var($mins_interval, FILTER_VALIDATE_INT, array('options' => array('min_range' => 10, 'max_range' => 3600)))) {
+          if (!filter_var($mins_interval, FILTER_VALIDATE_INT, array('options' => array('min_range' => 1, 'max_range' => 3600)))) {
             $_SESSION['return'] = array(
               'type' => 'danger',
               'msg' => sprintf($lang['danger']['access_denied'])
@@ -1448,7 +1448,7 @@ function mailbox($_action, $_type, $_data = null, $attr = null) {
               );
               return false;
             }
-            if (!filter_var($mins_interval, FILTER_VALIDATE_INT, array('options' => array('min_range' => 10, 'max_range' => 3600)))) {
+            if (!filter_var($mins_interval, FILTER_VALIDATE_INT, array('options' => array('min_range' => 1, 'max_range' => 3600)))) {
               $_SESSION['return'] = array(
                 'type' => 'danger',
                 'msg' => sprintf($lang['danger']['access_denied'])
diff --git a/data/web/modals/mailbox.php b/data/web/modals/mailbox.php
index b70cbe13..3f05f8f8 100644
--- a/data/web/modals/mailbox.php
+++ b/data/web/modals/mailbox.php
@@ -374,7 +374,7 @@ if (!isset($_SESSION['mailcow_cc_role'])) {
 					<div class="form-group">
 						<label class="control-label col-sm-2" for="mins_interval"><?=$lang['add']['mins_interval'];?></label>
 						<div class="col-sm-10">
-              <input type="number" class="form-control" name="mins_interval" min="10" max="3600" value="20" required>
+              <input type="number" class="form-control" name="mins_interval" min="1" max="3600" value="20" required>
               <small class="help-block">10-3600</small>
 						</div>
 					</div>
diff --git a/data/web/modals/user.php b/data/web/modals/user.php
index 50a6922c..8c607259 100644
--- a/data/web/modals/user.php
+++ b/data/web/modals/user.php
@@ -53,7 +53,7 @@ if (!isset($_SESSION['mailcow_cc_role'])) {
 					<div class="form-group">
 						<label class="control-label col-sm-2" for="mins_interval"><?=$lang['add']['mins_interval'];?></label>
 						<div class="col-sm-10">
-              <input type="number" class="form-control" name="mins_interval" min="10" max="3600" value="20" required>
+              <input type="number" class="form-control" name="mins_interval" min="1" max="3600" value="20" required>
               <small class="help-block">10-3600</small>
 						</div>
 					</div>