diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index e013423f33..a958a39114 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -255,6 +255,18 @@ public class MessageHelper {
     static final String FLAG_PHISHING = "$Phishing"; // Gmail
     static final String CATEGORY_PREFIX = "$category:";
 
+    // https://documentation.open-xchange.com/7.10.6/middleware/mail/mail_flagging.html
+    static final String FLAG_OPENX_RED = "$cl_1";
+    static final String FLAG_OPENX_BLUE = "$cl_2";
+    static final String FLAG_OPENX_GREEN = "$cl_3";
+    static final String FLAG_OPENX_GRAY = "$cl_4";
+    static final String FLAG_OPENX_PURPLE = "$cl_5"; // Violet
+    static final String FLAG_OPENX_LIGHT_GREEN = "$cl_6";
+    static final String FLAG_OPENX_ORANGE = "$cl_7";
+    static final String FLAG_OPENX_PINK = "$cl_8";
+    static final String FLAG_OPENX_LIGHT_BLUE = "$cl_9"; // Cyan
+    static final String FLAG_OPENX_YELLOW = "$cl_10";
+
     // https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
     // Not black listed: Gmail $Phishing
     private static final List<String> FLAG_BLACKLIST = Collections.unmodifiableList(Arrays.asList(
diff --git a/app/src/main/java/eu/faircode/email/TupleKeyword.java b/app/src/main/java/eu/faircode/email/TupleKeyword.java
index 7787bce346..7d957895c7 100644
--- a/app/src/main/java/eu/faircode/email/TupleKeyword.java
+++ b/app/src/main/java/eu/faircode/email/TupleKeyword.java
@@ -194,6 +194,17 @@ public class TupleKeyword {
                 return context.getString(R.string.title_keyword_complaint);
             case MessageHelper.FLAG_PHISHING:
                 return context.getString(R.string.title_keyword_phishing);
+            case MessageHelper.FLAG_OPENX_RED:
+            case MessageHelper.FLAG_OPENX_BLUE:
+            case MessageHelper.FLAG_OPENX_GREEN:
+            case MessageHelper.FLAG_OPENX_GRAY:
+            case MessageHelper.FLAG_OPENX_PURPLE:
+            case MessageHelper.FLAG_OPENX_LIGHT_GREEN:
+            case MessageHelper.FLAG_OPENX_ORANGE:
+            case MessageHelper.FLAG_OPENX_PINK:
+            case MessageHelper.FLAG_OPENX_LIGHT_BLUE:
+            case MessageHelper.FLAG_OPENX_YELLOW:
+                return keyword.replace("$cl", "color");
             default:
                 return keyword;
         }
@@ -221,6 +232,28 @@ public class TupleKeyword {
             case MessageHelper.FLAG_PHISHING:
                 return Helper.resolveColor(context, androidx.appcompat.R.attr.colorError);
 
+            // https://en.wikipedia.org/wiki/Web_colors
+            case MessageHelper.FLAG_OPENX_RED:
+                return Color.rgb(255, 0, 0);
+            case MessageHelper.FLAG_OPENX_BLUE:
+                return Color.rgb(0, 0, 255);
+            case MessageHelper.FLAG_OPENX_GREEN:
+                return Color.rgb(0, 128, 0);
+            case MessageHelper.FLAG_OPENX_GRAY:
+                return Color.rgb(128, 128, 128);
+            case MessageHelper.FLAG_OPENX_PURPLE:
+                return Color.rgb(128, 0, 128);
+            case MessageHelper.FLAG_OPENX_LIGHT_GREEN:
+                return Color.rgb(144, 238, 144);
+            case MessageHelper.FLAG_OPENX_ORANGE:
+                return Color.rgb(255, 165, 0);
+            case MessageHelper.FLAG_OPENX_PINK:
+                return Color.rgb(255, 192, 203);
+            case MessageHelper.FLAG_OPENX_LIGHT_BLUE:
+                return Color.rgb(173, 216, 230);
+            case MessageHelper.FLAG_OPENX_YELLOW:
+                return Color.rgb(255, 255, 0);
+
             default:
                 return null;
         }