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