Can't specifically answer this, but do know we're making a big newsletter push. We seem to send them during morning and afternoon drive. Not sure if the idea is to try and catch the commuting crowd.
Those times generally are right as workers get in and right as people leave work.
We're also doing a number of e-mail pushes that aren't newsletters per se. We'll blast out a recap of the weekend's top reads on Monday, for instance. (I don't think it's that novel, but for us it is.)
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I try to send my weekly sports email around 5:30 p.m. to catch that commuting crowd. our most successful emails go in the morning, but they're news based. you should try some a-b testing to see what works best for your market or subject area.
The newsletter we run [I run a craft beer business magazine] goes out on Weds. and Saturday at 10 a.m. So it's still in the morning for the east coasters who may be starting their day or might check at lunch yet it gets to the west coasters early so they can check it before heading into work.
We usually track around 26% open rate with 17% click through (both above average for what some analytics have shown)