We put out a daily newsletter on CC to 3000+ addresses and open rates have tended to be in the upper 30s. A few times, we have seen drops in contacts receiving the emails, and the problem has occurred, with the past few open rates around 20% or less. (See portion in chart below highlighted in red). The last time this happened, at the end of March, it appeared to be Microsoft 365 filtering out CC emails, and the problem self-corrected eventually. We have a few board members where I work who get the emails on their personal gmail addresses but not their office emails. Anyone aware of a workaround? Interestingly, these drops at both times followed short windows where the open rate was in the upper 40s.
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