Outbound SMTP Relay by domain name

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http://forums.cpanel.net – I have a customer who has recently begun using GFI Mail protection and archiving to take care of some legal requirements to archive e-mail. We seem to have the incoming working fine. We changed the MX records to reflect the GFI mail servers. However, I need to force my cpanel server to send e-mails from their domain to the gfi outbound smtp server. Can someone assist me and explain to me how to do this? BTW the client has its own dedicated IP address however my server is not sending mail specifically from that address. Thanks in advance. (HowTos)