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@jasonkonopinski I wonder if it was also influenced at all by the days you were sending them—while it totally makes since in the context you mention, normally the best days for newsletters are Tuesdays and Wednesdays. On Monday most people have too much to catch up on from the weekend and they are quicker to hit delete, spam, etc. and on Friday's most people are in a rush to get out of the office and, again, are more likely to hit delete/spam.
When I was working at a magazine company, the best open rate results we got were Wed. newsletters, around 11am.
3 years ago on How Often Should I Send Email Newsletters?