diff --git a/app/src/main/java/eu/faircode/email/Core.java b/app/src/main/java/eu/faircode/email/Core.java
index f4b5ea1bc4..11bc83375a 100644
--- a/app/src/main/java/eu/faircode/email/Core.java
+++ b/app/src/main/java/eu/faircode/email/Core.java
@@ -3505,12 +3505,12 @@ class Core {
                         message.identity = (identity == null ? null : identity.id);
                         boolean fromSelf = message.fromSelf(identity);
 
+                        List<String> signers = new ArrayList<>();
                         if (native_dkim &&
                                 !fromSelf &&
                                 !EntityFolder.isOutgoing(folder.type) &&
                                 !BuildConfig.PLAY_STORE_RELEASE) {
-                            List<String> signers = helper.verifyDKIM(context);
-                            message.signedby = (signers.isEmpty() ? null : TextUtils.join(",", signers));
+                            signers.addAll(helper.verifyDKIM(context));
                             message.dkim = !signers.isEmpty();
                             if (message.dkim) {
                                 boolean aligned = helper.isAligned(context, signers, message.return_path, message.smtp_from, message.from);
@@ -3521,6 +3521,11 @@ class Core {
                             }
                         }
 
+                        String signer = helper.getSigner(authentication);
+                        if (signer != null)
+                            signers.add(0, signer);
+                        message.signedby = (signers.isEmpty() ? null : TextUtils.join(",", signers));
+
                         if (message.size == null && message.total != null)
                             message.size = message.total;
 
@@ -4666,12 +4671,12 @@ class Core {
             message.identity = (identity == null ? null : identity.id);
             boolean fromSelf = message.fromSelf(identity);
 
+            List<String> signers = new ArrayList<>();
             if (native_dkim &&
                     !fromSelf &&
                     !EntityFolder.isOutgoing(folder.type) &&
                     !BuildConfig.PLAY_STORE_RELEASE) {
-                List<String> signers = helper.verifyDKIM(context);
-                message.signedby = (signers.isEmpty() ? null : TextUtils.join(",", signers));
+                signers.addAll(helper.verifyDKIM(context));
                 message.dkim = !signers.isEmpty();
                 if (message.dkim) {
                     boolean aligned = helper.isAligned(context, signers, message.return_path, message.smtp_from, message.from);
@@ -4682,6 +4687,11 @@ class Core {
                 }
             }
 
+            String signer = helper.getSigner(authentication);
+            if (signer != null)
+                signers.add(0, signer);
+            message.signedby = (signers.isEmpty() ? null : TextUtils.join(",", signers));
+
             // Borrow reply name from sender name
             if (message.from != null && message.from.length == 1 &&
                     message.reply != null && message.reply.length == 1) {
diff --git a/app/src/main/java/eu/faircode/email/MessageHelper.java b/app/src/main/java/eu/faircode/email/MessageHelper.java
index da2b67f27a..08427c4a6e 100644
--- a/app/src/main/java/eu/faircode/email/MessageHelper.java
+++ b/app/src/main/java/eu/faircode/email/MessageHelper.java
@@ -2233,6 +2233,28 @@ public class MessageHelper {
         return mailfrom;
     }
 
+    String getSigner(String[] headers) {
+        if (headers == null || headers.length == 0)
+            return null;
+
+        int semi = headers[0].indexOf(';');
+        if (semi < 0)
+            return null;
+        String signer = headers[0].substring(0, semi).trim();
+
+        if (signer.toLowerCase(Locale.ROOT).startsWith("i=")) {
+            int semi2 = headers[0].indexOf(';', semi + 1);
+            if (semi2 < 0)
+                return null;
+            signer = headers[0].substring(semi + 1, semi2).trim();
+        }
+
+        if (TextUtils.isEmpty(signer))
+            signer = null;
+
+        return signer;
+    }
+
     boolean getSPF() throws MessagingException {
         ensureHeaders();