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Thread: DKIM Signing versus zimbraMtaRelayHost

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    Oct 2009
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    Default DKIM Signing versus zimbraMtaRelayHost

    For context: we're currently running 6.0.1 Network Edition on CentOS machines (hosted on Amazon EC2 instances).

    To start with, we had successfully enabled outbound DKIM signing by adding the following to ~zimbra/conf/amavisd.conf, then running "zmamavisdctl restart"
    $enable_dkim_signing = 1;
    dkim_key('<dkim-domain>', '<dkim-selector>', '<dkim-private-key-filename>');
    @mynetworks = qw(;
    Some time later, we configured Zimbra to relay email through our corporate server using:
    - "zmprov ms $(hostname) zimbraMtaRelayHost $relayserver:$relayport"
    - creation of ~zimbra/conf/relay_config with our values
    - "postmap hash:/opt/zimbra/conf/relay_config"
    - several postconf's to set smtp_* values
    - "postfix reload"

    While this works (email is relayed as expected), outbound emails are no longer being DKIM-signed. We don't want to do DKIM signing on the relay server, either, so I have two questions for the Postfix / Zimbra gurus:

    - Is this incompatibility likely being caused by an ordering of Postfix operations? (That is, is DKIM signing being done 'after' the relayhost procedure?)

    - If so, is there a simple way to reorder these steps, so that mail is signed _before_ being relayed to our corporate server?

    I would greatly appreciate any and all feedback. :-)
    Last edited by EmOperations; 05-13-2010 at 08:56 AM.

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