How do I add different Footer per domain?

[Fajar]

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Hello All,

All my incoming and outgoing emails add this footer :
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
www.simplimobile.com

My mail server host multiple domains, how do I make MailScanner add 
different domain address based on sender or reception domain that mail 
server host.

Thanks.
PS : Sorry for bad English :( 

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