We've been getting sporadic return errors from a subscriber. I figured odds are that someone here has run into this particular one before. Thanks for any help - stats are below. Audrey, Fibrom-L Subject: Returned mail: Error During Delivery ------ Here is your List of Failed Recipients ------ <[log in to unmask]> Destination mail server returned error code 453. -------- Here Is Your Returned Mail -------- Received: FROM cherry.ease.lsoft.com BY virscan.xxx.net