Enable X-UIDONLY if available

app/src/main/java/com/sun/mail/imap/IMAPStore.java

@@ -1652,6 +1652,18 @@ public class IMAPStore extends Store
 		}
 	}
 
+	public synchronized void enable(String capability) throws ProtocolException, StoreClosedException {
+		IMAPProtocol p = null;
+		try {
+			p = getStoreProtocol("enable(" + capability + ")");
+			p.enable(capability);
+		} catch (ConnectionException cex) {
+			throw new StoreClosedException(this, cex.getMessage());
+		} finally {
+			releaseStoreProtocol(p);
+		}
+	}
+
     /**
      * Set the user name to be used with the PROXYAUTH command.
      * The PROXYAUTH user name can also be set using the

app/src/main/java/eu/faircode/email/EmailService.java

@@ -37,6 +37,7 @@ import androidx.annotation.NonNull;
 import androidx.preference.PreferenceManager;
 
 import com.sun.mail.gimap.GmailSSLProvider;
+import com.sun.mail.iap.ProtocolException;
 import com.sun.mail.imap.IMAPFolder;
 import com.sun.mail.imap.IMAPStore;
 import com.sun.mail.pop3.POP3Store;
@@ -755,6 +756,14 @@ public class EmailService implements AutoCloseable {
                         throw ex;
                 }
 
+            // Verizon
+            if (istore.hasCapability("X-UIDONLY") && istore.hasCapability("ENABLE"))
+                try {
+                    istore.enable("X-UIDONLY");
+                } catch (ProtocolException ex) {
+                    Log.e(ex);
+                }
+
         } else if ("smtp".equals(protocol) || "smtps".equals(protocol)) {
             // https://tools.ietf.org/html/rfc5321#section-4.1.3
             String hdomain = getDefaultEhlo();