This seems to be impossible at the moment, as the target mailserver does not accept the double bounce messages the other two mailservers are generating. I get the following in the logfile:
nbg2 courieresmtpd: error,relay=::ffff:81.2.179.57,from=<[EMAIL PROTECTED]>: 517 Syntax error.
Is there something I can change in the configuration or is this setup not possible with courier?
Double-bounces must be delivered locally. Double bounces cannot be forwarded to an external mailbox. Otherwise there is a potential for mail loops.
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