rewrote sign-only code, also finally recognize sign-only emails in the list and allow opening them for verification

res/values/strings.xml

@@ -32,6 +32,7 @@
 
     <string name="btn_send">Send via Email</string>
     <string name="btn_decrypt">Decrypt</string>
+    <string name="btn_verify">Verify</string>
     <string name="btn_selectEncryptKeys">Select Recipients</string>
     <string name="btn_reply">Reply</string>
     <string name="btn_encryptMessage">Encrypt Message</string>