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Icinga: Monitor refused mails in postfix mailqueue

In case your server gets listed on blacklists, mails will get refused by destination servers and stick in the deferred mail queue for some time until the sender finally gets a mailer daemon. As it...

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Zimbra: Using zmpostfixpolicyd to stop backscatter

A Zimbra 8.0 Server (on Ubuntu) was backscattering. Unfortunately Zimbra servers cannot use the postfix setting smtpd_reject_unlisted_sender=yes when an alias domain is setup. Everybody says it is...

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