SMTP Problem !

I need to know like I have my own dedicated server. And some clients use outlook and they travel a lot, but I know to how can I setup my own SMTP like for setting now they use


Incoming: mail.xxx.com
Outgoing: local ISP SMTP


But I need to do this way


Incoming: mail.xxx.com
Outgoing: mail.xxx.com or smtp.xxx.com


How can I do that can any one help me in this. Thanks.

 

 

 

 

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