Postfix Sending via secondary SMTP server as redundancy

[adza]

Hi,

We have Postfix configured within our office to deliver emails on our email clients behalf (instead of using their ISP's SMTP sever).

I was wondering if it's possible to configure postfix to use a seperate SMTP server (such as our ISP's) if it is unable to send email itself.

(ie, if our IP address is blocked by an external party, or if our server is unable to resolve a mx for a domain, etc).

I'm guessing this is well outside the scope of normal usage, but was wondering if it's possible, and if it's easy to do?

Thanks & Regards

Adam.

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