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DKIM - Multiple Domains

[Hollyman, Chris]
Chris Hollyman
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Chris Hollyman - 07:22pm, Sep 7 2021

Hi,

This is a question about DKIM. I have read the documentation, whether I understand it or not is another questions, and I have a question about multiple domains.

I host around 30 domains on my Mdaemon server. I would like to start to use DKIM however I am confused as to how to do that for each domain selectively. I "think" I want to have a selector that matches a domainkey from that domains' DNS record. At the moment if i create a new selector for a clients domain, the suggested DNS entries are always selectorname._domainkeys.mydomain.com and I would like selectorname._domainkeys.clientsdomain.com

I want each domain to be able to have its own DNS TXT record that corresponds to a selector. Am I way off with this or can you suggest what I do?

Thanks

Chris

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Arron Caruth - Sep 8, 2021 7:30 am (#1 Total: 1)  

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You are exactly right.

You need to create a DNS TXT record for each domain at $SELECTOR$._domainkey.$DOMAIN$.  Notice it should be "_domainkey" not "_domainkeys".

You can either create a single selector in MDaemon and use it for all domains, or create a selector for each domain, or you could break it up even smaller, but this gets harder to configure.  I'd suggest either a single selector for all domains or a unique selector for each domain.  

To create a selector open MDaemon and go to Security / Security Manager / Sender Authentication / DKIM Signing, check the box for Sign eligible outbound messages using DKIM.  In the Default Selector drop-down type the name of the selector you want to use, then click Create new public and private keys.  A text box will open with the information for creating the DNS record. 

After creating all the DNS records, you can make all messages eligible for signing by checking the box for "All Messages from local domains are eligible for signing."  This will sign all messages from local domains using the default selector.  

If you want to configure a different selector for domains, click the button for Define which messages are eligible for signing.  In the editor that opens enter the following for each domain:

from *@$DOMAIN$ s=$SELECTOR$

Where $DOMAIN$ is replaced by the actual domain name and $SELECTOR$ is replaced by the selector name you created earlier for the domain.

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On Tue, 7 Sep 2021 19:22:38 -0500, "lists-md-configuration@mdaemon.com (Chris Hollyman)" <lists-md-configuration@mdaemon.com> wrote:
Hi,

This is a question about DKIM. I have read the documentation, whether I understand it or not is another questions, and I have a question about multiple domains.

I host around 30 domains on my Mdaemon server. I would like to start to use DKIM however I am confused as to how to do that for each domain selectively. I "think" I want to have a selector that matches a domainkey from that domains' DNS record. At the moment if i create a new selector for a clients domain, the suggested DNS entries are always selectorname._domainkeys.mydomain.com and I would like selectorname._domainkeys.clientsdomain.com

I want each domain to be able to have its own DNS TXT record that corresponds to a selector. Am I way off with this or can you suggest what I do?

Thanks

Chris


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