diff --git a/CHANGELOG b/CHANGELOG
index b02a19aea..462a1f6aa 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -24,6 +24,7 @@ RELEASE 1.3.1
 - Fix bug where messages count was not updated after delete when imap_cache is set (#5872)
 - Fix potential XSS vulnerability with malformed HTML message markup
 - Bring back double-click behavior on the message list which was removed in 1.3.0 (#5823)
+- Enigma: Fix decrypting an encrypted+signed message when signature verification fails (#5914)
 
 RELEASE 1.3.0
 -------------
diff --git a/plugins/enigma/lib/enigma_driver_gnupg.php b/plugins/enigma/lib/enigma_driver_gnupg.php
index 0c72137ec..a8d84ebea 100644
--- a/plugins/enigma/lib/enigma_driver_gnupg.php
+++ b/plugins/enigma/lib/enigma_driver_gnupg.php
@@ -153,7 +153,7 @@ class enigma_driver_gnupg extends enigma_driver
                 $this->gpg->addDecryptKey($key, $password);
             }
 
-            $result = $this->gpg->decryptAndVerify($text);
+            $result = $this->gpg->decryptAndVerify($text, true);
 
             if (!empty($result['signatures'])) {
                 $signature = $this->parse_signature($result['signatures'][0]);
@@ -463,7 +463,7 @@ class enigma_driver_gnupg extends enigma_driver
     {
         $data = new enigma_signature();
 
-        $data->id          = $sig->getId();
+        $data->id          = $sig->getId() ?: $sig->getKeyId();
         $data->valid       = $sig->isValid();
         $data->fingerprint = $sig->getKeyFingerprint();
         $data->created     = $sig->getCreationDate();
diff --git a/plugins/enigma/lib/enigma_ui.php b/plugins/enigma/lib/enigma_ui.php
index ba0acd436..a9036522f 100644
--- a/plugins/enigma/lib/enigma_ui.php
+++ b/plugins/enigma/lib/enigma_ui.php
@@ -919,7 +919,10 @@ class enigma_ui
             $attrib['id'] = 'enigma-message';
 
             if ($sig instanceof enigma_signature) {
-                $sender = ($sig->name ? $sig->name . ' ' : '') . '<' . $sig->email . '>';
+                $sender = $sig->name ?: '';
+                if ($sig->email) {
+                    $sender .= ' <' . $sig->email . '>';
+                }
 
                 if ($sig->valid === enigma_error::UNVERIFIED) {
                     $attrib['class'] = 'enigmawarning';
@@ -934,7 +937,13 @@ class enigma_ui
                 }
                 else {
                     $attrib['class'] = 'enigmawarning';
-                    $msg = rcube::Q(str_replace('$sender', $sender, $this->enigma->gettext('siginvalid')));
+                    if ($sender) {
+                        $msg = rcube::Q(str_replace('$sender', $sender, $this->enigma->gettext('siginvalid')));
+                    }
+                    else {
+                        $msg = rcube::Q(str_replace('$keyid', enigma_key::format_id($sig->id),
+                            $this->enigma->gettext('signokey')));
+                    }
                 }
             }
             else if ($sig && $sig->getCode() == enigma_error::KEYNOTFOUND) {