One of the applications sends mail to the users on daily basis. It sends mail within (internal users) the firewall (e.g., username@companyname.com) and not sending mail outside (external users) the firewall (e.g., username@yyyy.com). When we contacted the admin people they informed us to register in SMTP, We registered it but still it is not sending mail to the external users. We have hardcoded the from address in the Perl script but when we checked the log it shows the group id of the application. We don't understand why it's taking the group id instead of the from id which we have hardcoded in the script. I understand that something needs to be changed in the sendmail.cf file but I don't have access to do that. Can anyone please give me some suggestion for this issue? Please let me know what needs to be changed so that I can talk to the admin people about this or even correct me if am in the wrong path. Thanks in advance.