[xux]

I actually did tons of A/B testing and 8:30am works way better than 6am (in terms of open rates). Honestly I've no idea why, but I have a few theories.

[AznHisoka]

6AM? Barely anyone is awake.

[xux]

I used that to compare because a lot of others email out at that time: Digg, WSJ, Quartz, etc.