How to rewrite From: address based on Sender IP address

[zcs]

Example:

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zimbraMtaMyNetworks: 127.0.0.0/8  192.168.100.1/32 192.168.100.2/32 

Any email sent from 192.168.100.1 should rewrite any

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/^from: (.*)$/ REPLACE from: server-a@example.com PREPEND X-From: $1

Any email sent from 192.168.100.2 should rewrite

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/^from: (.*)$/ REPLACE from:: server-b@example.com PREPEND X-From: $1

Any possibility to implement this using custom script or any inbuilt feature ?