Wietse:
> 2) Use a SOCKS server for one or more dedicated external source IP
> addresses. This would require an extension of the SOCKS protocol
> such that the Postfix SMTP client can specify both the local and
> the remote IP address for a connection.

Ram:
> Option 2 seems perfect
> Please is there a SMTP over socks example somewhere I can use ? I am not 
> able to find any

You won't find any. SOCKS is most often used in combination with
other protocols.  Nor do I expect that anyone has implemented an
extension to specify both source and destination IP addresses. 

This isn't rocket science, but the use case is so rare that I can't
justify investing time into it.

        Wietse

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