I am running LISTSERV 1.8e and using SENDMAIL on an Unix machine. My problem is that some of my mail files are getting stuck in the spool. For every message we send with approximately 2500 names listed, we lose two files containing about 50 names each. Consequently, about 100 people are not getting the required information in a timely manner. Has anyone seen something similar and have any recommendations? Can we make changes to the LISTSERV optimization files to correct this problem? Thanks for you assistance. C. S.