Hey, that’s great to hear! Glad you’re liking it so far.
All posts have a 15 minute delay for sending out via email. This also includes future-dated posts – as long as they don’t get sent out initially, they’ll go out 15 minutes after the “published” date you set.
Unfortunately we don’t support this right now, but we will in the future! This has been a long-requested feature.
For now, one workaround is to create a post and set its “published” date to a time in the past, outside that 15 minute window when it would send (say, 30 minutes earlier). You can also find other workarounds in this feature request thread: "Send to Subscribers" Option for email - #5 by justinf