Here is just a view of my current numbers. I think the open rate has dropped and 1k is no longer a good number for getting verified. The increase in the number of users is probably the reason for this and I am not sure if people gave it a try then quit either.
Of course, it's possible that they just weren't interested in Rising Star and my giveaway.
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That last sentence is important ;) As there are a lot of users sending out Rising Start emails, so you may be spot on that people just skip opening them. I open all emails personally, I just don't vote them all.
But again, that's why I added 250 to 500 is a safer bet. And this is up to each person to decide for themselves, looking at their stats. In your case, I'd surely up that with at least 250. If you want to play even safer, 500. So that I totally agree on :)
I would like to add that you also probably should take into account that you haven't been very active mailing stuff, you have one at Feb 5, Feb 15 and March 5. That's with longer intervals than weekly. People don't know you well-enough maybe. I'd try to step up and email as soon as you can every week, and send it to 1500 to see how that goes. You should not forget more and more enterprise members are appearing so you will have to stand up and share something unique, probably forget the rising star ref for a while, unless you have more emails to send of course.