I receive an average of 3 of those per week. I am frustrated because I can't connect them with any particular person or server. *********** REPLY SEPARATOR *********** On 1/25/01 at Paul Russell wrote: . :: ::The null envelope sender address makes it difficult to block these messages ::at the mail server level, unless the mail server is doing virus detection ::or other forms of content filtering, however, the constant "from" address ::can be filtered by LISTSERV, either at the site level or the list level. Muriel Hykes List manager for more than a few lists, of which this may or may not be one of them. [log in to unmask]