Hi, I have a RedHat Linux box - Red Hat Enterprise Linux AS release 3 and have a monitoring application installed on the box. The application sends alerts to my local domain ids' . e.g : email@example.com. The problem is I do not get alerts on yahoo or gmail or hotmail account. I have checked the sendmail.cf and seems to be OK. The maillog file looks like this when sending email using sendmail -v -s commands to the firstname.lastname@example.org id. Apr 6 12:59:10 HOSTNAME sendmail: l36Gx9eO031882: email@example.com, ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=33218, relay=mailrelay.DOMAIN.com [xx.xx.xx.xx], dsn=2.0.0, stat=Sent ( <200704061659.l36Gx9eO031882@HOSTNAME.DOMAIN.com> Queued mail for delivery). I understand that when I send a test mail from the box .. I get email on my local id and the sender name is firstname.lastname@example.org .. and actually it should come from a valid account id .. like email@example.com. The firstname.lastname@example.org is getting lost in the Interent cloud as invalid and hence cannot get emails on outside domains. PLEASE HELP ..NEED URGENT HELP.