swamprat96
6 years ago
I have a Hybrid environment with the majority of mailboxes on 365 but some mailboxes still on on premise exchange along with authorised SMTP servers.

I have DKIM working fine for Office365 with two selector keys as CNAMEs:
selector1-xxx-xxx-xxx-xx._domainkey
selector2-xxx-xxx-xxx-xx._domainkey
and have enabled DKIM in Office365

Now on Premise where I have the same domain I use two Fortimail appliances where I can create the DKIM keys - one for each appliance and activate them.
My question is- Can I simply create two additional CNAMEs for these additional records on the same domain?
ivan
  • ivan
  • 100% (Exalted)
  • Administration
6 years ago

I have a Hybrid environment with the majority of mailboxes on 365 but some mailboxes still on on premise exchange along with authorised SMTP servers.

I have DKIM working fine for Office365 with two selector keys as CNAMEs:
selector1-xxx-xxx-xxx-xx._domainkey
selector2-xxx-xxx-xxx-xx._domainkey
and have enabled DKIM in Office365

Now on Premise where I have the same domain I use two Fortimail appliances where I can create the DKIM keys - one for each appliance and activate them.
My question is- Can I simply create two additional CNAMEs for these additional records on the same domain?

Originally Posted by: swamprat96 



Yes, you can simply create different selector on premise server,
selector3 .... , it won't take effect to your office 365 DKIM.

Here is the detail:
https://www.emailarchitect.net/domainkeys/kb/dkim_exchange_2007_2010_2013.aspx#using-dkim-selector-with-the-same-domain-on-multiple-exchange-servers 
swamprat96
6 years ago
thanks heaps- exactly what I was looking for
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