the problem was that email that was sent from the email server itself went out with a from of [email protected] instead of [email protected] The submit.cf was changed so that it now has: Code: divert(0)dnl include(`/usr/share/sendmail-cf/m4/cf.m4') VERSIONID(`linux setup for Red Hat Linux')dnl define(`confCF_VERSION', `Submit')dnl define(`__OSTYPE__',`')dnl dirty hack to keep proto.m4 from complaining define(`_USE_DECNET_SYNTAX_', `1')dnl support DECnet define(`confTIME_ZONE', `USE_TZ')dnl define(`confDONT_INIT_GROUPS', `True')dnl define(`confPID_FILE', `/var/run/sm-client.pid')dnl dnl define(`confDIRECT_SUBMISSION_MODIFIERS',`C') FEATURE(`use_ct_file')dnl dnl dnl If you use IPv6 only, change [127.0.0.1] to [IPv6:::1] FEATURE(`msp', `[127.0.0.1]')dnl define(`confDOMAIN_NAME', `ourpc.org')dnl The problem is that we host another domain name and some of our desktop email is supposed to go out as [email protected], and in fact if the email client was setup correctly on the workstations, the email did go out as from [email protected] but now they all go out as [email protected] How can I set it up so that the domain name the email client on the LAN workstations uses is the one that gets used on the outgoing mail ? Or to put another way, how can I set it up so that only the @net.ourpc.org of any outgoing email gets changed to @ourpc.org ?