[root at vuwunicomailmn1 mailman]# /usr/lib/mailman/bin/sync_members -n -f /var/lib/mailman/STUDENT_EMAIL.txt All_Active_Students Dry run mode Invalid : You must fix the preceding invalid addresses first. [root at vuwunicomailmn1 mailman]# So a corrupt/bad email address in mailman? or in the updating file? regards Steven