Give Outlook 10 minutes to add a sent message

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

@@ -138,7 +138,7 @@ class Core {
     private static final long LOCAL_RETRY_DELAY = 5 * 1000L; // milliseconds
     private static final int TOTAL_RETRY_MAX = LOCAL_RETRY_MAX * 5;
     private static final long EXISTS_RETRY_DELAY = 20 * 1000L; // milliseconds
-    private static final long EXISTS_RETRY_DELAY_OUTLOOK = 3 * 60 * 1000L; // milliseconds
+    private static final long EXISTS_RETRY_DELAY_OUTLOOK = 10 * 60 * 1000L; // milliseconds
     private static final int FIND_RETRY_COUNT = 3; // times
     private static final long FIND_RETRY_DELAY = 5 * 1000L; // milliseconds
     private static final int POP3_KEEP_EXTRA = 100; // messages