diff --git a/FAQ.md b/FAQ.md
index c320f22930..0842ccb1c7 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -4473,7 +4473,7 @@ To show shields, the option *Show authentication status indicator* in the displa
 
 A message will be consired safely transported if every [Received](https://datatracker.ietf.org/doc/html/rfc2821#section-4.4) header:
 
-* contains the word 'TLS'
+* contains the phrase 'using TLS' or 'version=TLS'
 * contains the phrase 'qmail <nnn> invoked by uid <nnn>'
 * has a *by* with a local address (site local or localhost)
 * has a *from* with a local address
diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index 5ceb43546a..460000cd8a 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -2061,7 +2061,8 @@ public class MessageHelper {
             if (semi > 0)
                 header = header.substring(0, semi);
 
-            if (header.contains("TLS")) {
+            if (header.contains("using TLS") ||
+                    header.contains("version=TLS")) {
                 Log.i("--- found TLS");
                 continue;
             }