We've been seeing declining click rates for the past several months that don't seem to be related to a change in our newsletter content. We did append Google custom campaign tracking codes to our links earlier in the year (similar to ?utm_source=newsletter&utm_medium=email&utm_campaign=fall2020) and one user has complained that his VPN and adware blocker won't let him open those links, so now we're wondering if that is contributing. I can't tell if he's unique; has anyone else seen such an issue?
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