Since upgrade from SQL Anywhere 9 to 16 (build 2283) we have problems with the database server that does not response anymore. All clients that are connected are freezing. A new connection in ISQL freezes after a click on the "Connect" button.
With request log we saw that the problem is in the command xp_startmail(). I created a small test sp that sends a email using the startmail, but the behavior is not always the same. Sometimes the db server freezes sometimes not.