Looks like we may be overdue for an update on this thread. We've released a number of significant changes to automated campaigns since this was originally posted. Among those changes include the ability to set custom delivery windows to limit sending to certain times/days of the week. There is also no longer the 24-48 hour delay for sending when a contact joins a list. You can choose to send immediately after a contact joins a list if you'd like.
These changes are for automated series, birthday and anniversary emails follow a different scheduling flow, but we do know there is similar feedback for those emails.
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