Email Signatures Marked as Spam from Mapped Domains

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Hi guys,

I recently had a client who has a mapped domain on our multisite using MU Domain mapping say that some of their emails are being marked as spam because of the link they include in their email signature to the mapped domain. They said that because the filter detected that the domain was connected to the subdomain, it was marked as a “potential bad intent” link.

Do you know how to solve this so that mapped domains are not connected to the multisite subdomain in any way that could cause problems with email signature links etc.?

Thanks for all your great work!