I am trying to add an email address as a sender address, but I am not receiving any authentication email. Why does this happen?

I am trying to add an email address as a sender address, but I am not receiving any authentication email. Why does this happen?

The email address you're trying to add might be a user in some other Zoho Campaigns organization. You cannot add a sender address which already exists in another org. Please try again after removing the user from the other org, or add a different email address.

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