To my knowledge reputation is tied to the “d=“ domain. The value of the key
is irrelevant with regards to reputation.
Using shared or unique key pairs is a balance between managebility and
security.

Maarten

On Mon, 9 Oct 2017 at 19:06, Alexander Burch <abu...@activecampaign.com>
wrote:

> Do major ISP check the public DKIM key for reputation metrics?
>
> For example, an ESP might use domain1.com, domain2.com and domain3.com to
> sign messages for different reputation pools.
>
> If these domains all have the same public DKIM key will this "blend" their
> reputations in any way, namely at Gmail? Will Gmail see the 3 domains use
> the same public key and link their reputations?
>
> Is there any advantage of using a unique public DKIM key for each domain
> to keep the reputations compartmentalized?
>
> Thanks,
> Alex
>
>
> Alex Burch
> ActiveCampaign / Deliverability Lead
> (800) 357-0402
> abu...@activecampaign.com
> 1 N. Dearborn St., Chicago , Il 60602, United States
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