On Wed, Dec 10, 2008 at 05:36:04PM +0100, Dennis // [EMAIL PROTECTED] wrote:
> But how would recipient verification behave when the customers
> mailserver is unavailable ?


Postfix then sends a temporary failure (4xx) back to the client.


> Would one have to rely on the cache or would postfix hold the mail ?


The results are cached by the verify(8) daemon.

Please refer to http://www.postfix.org/verify.8.html for relevant
configuration settings.

All this is explained in:
http://www.postfix.org/ADDRESS_VERIFICATION_README.html

        Geert


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