Email link branding allows all of the click-tracked links and open events in your emails to be tracked and recorded as if they were coming from your domain, instead of Sendgrid's. This helps with deliverability as spam filters and servers sometimes use these values for filtering purposes. Namely, they use the reputation of the root domain to determine whether the links appear to be trustworthy. Implementing link labeling helps because you are no longer relying on click-tracking being read from a domain that you don't control.
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