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Postfix deferred email - How to expire so bounce-back email gets sent back

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linux-howto

http://serverfault.com – My hosted email server is "Refusing to talk : 550" with my postfix server. Gmail, Yahoo, Hotmail all accepts them fine. All of sudden hosted email provider decided not accept email from my server. I dont really know why... i dont send out spam nor have large volumes. Anyways, now they want me to get a bounce-back email. All the email in question are in mailq (deferred) How do I expire them so that postfix will send out "unable to send" to mail clients who sent them? I dont want to delete them... Thanks for the help in advance (HowTos)