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According to a study by Axios HQ that analyzed 8.7 million emails, between 3 p.m. and 6 p.m. on Sunday is the best time to send an internal email. The research found that on average 94 percent of these emails were opened. Axios said, “Sending an internal e-mail when the competition is low, such as on a Sunday night, is seen as the first thing on a Monday morning and is remembered by the interlocutors. […]