I hope someone can help me out! We are currently sending out a newsletter on a bi-monthly basis - one of our largest email blasts. In 2019, the average open rate was around 30%/35% per newsletter. Since the beginning of 2020, this rate dropped and the 3 newsletters we sent out this year all ended up around the 25%. We do not know what has caused this sudden drop so consistently, as the newsletter remained similar in quality as did the target audiences. We have done some A/B testing for any changes in 2020 versus 2019, but nothing big came out of this. I know open rates are not always accurate but a -10% drop is extremely big. I am enticed to think it could be due to a different way open rates are measured by Marketo/ISPs, because it happened year-over-year, but that is just an assumption.  Does anyone have any ideas what could have cause this large drop or how we can tackle this?   ... View more