Well, if only sendmail is the responsible, why only happend when I send a mail to listserv, and never if I send a mail to all users ono to one??? It´s possible a conflict between sendmail (8.9 and later) and listserv?? . Why always lost consecutive users??. Regards, At 11:36 18/05/00 -0400, Nathan Brindle wrote: >LISTSERV isn't involved at this point at all. Sendmail is the entity >that is unable to find the user. > >Nathan -- ------------------------------------------------------------------------------------------- Mercedes Giménez Barrio e-mail: [log in to unmask] Unidad Técnica de Comunicaciones Phone: +34 91 397 51 53 Tecnologías de la Información Universidad Autónoma de Madrid Fax : +34 91 397 39 14 E-28049 Cantoblanco. España (SPAIN) -------------------------------------------------------------------------------------------