diff --git a/backend/imap/config.php b/backend/imap/config.php
index 8f8ca1da..db7a4030 100644
--- a/backend/imap/config.php
+++ b/backend/imap/config.php
@@ -55,6 +55,9 @@
 define('IMAP_OPTIONS', '/notls/norsh');
 
 
+// Mark messages as read before deleting them
+define('IMAP_AUTOSEEN_ON_DELETE', false);
+
 
 // IMPORTANT: BASIC IMAP FOLDERS [ask your mail admin]
         // We can have diferent cases (case insensitive):
diff --git a/backend/imap/imap.php b/backend/imap/imap.php
index cbd4cf1e..60014dfc 100644
--- a/backend/imap/imap.php
+++ b/backend/imap/imap.php
@@ -1525,6 +1525,9 @@ public function DeleteMessage($folderid, $id, $contentparameters) {
         $this->imap_reopen_folder($folderImapid);
 
         if ($this->imap_inside_cutoffdate(Utils::GetCutOffDate($contentparameters->GetFilterType()), $id)) {
+            if (defined('IMAP_AUTOSEEN_ON_DELETE') && IMAP_AUTOSEEN_ON_DELETE == true) {
+                $s0 = @imap_setflag_full($this->mbox, $id, "\\Seen", FT_UID);
+            }
             $s1 = @imap_delete ($this->mbox, $id, FT_UID);
             $s11 = @imap_setflag_full($this->mbox, $id, "\\Deleted", FT_UID);
             $s2 = @imap_expunge($this->mbox);