[knightinblue]

One of the reasons I'd prefer to run it in-house is because users' emails are valuable data and we prefer to keep it with us rather than outsource to something like Aweber.

Another reason is the cost. Once email lists get into the tens of thousands, it becomes expensive to have someone else like Aweber handle them. I have a feeling it'd be cheaper to run it in-house. I don't really have any hard data to prove this of course, just assuming based on the fact that most startups do it this way.

Finally, based on the little bit that I've read, it's the initial setup (servers, IPs, subscribe/unsubscribe requests) that takes effort. But once it's automated, things will be humming along nicely, provided there's regular periodic monitoring of course.

I'm pretty sure startups run email delivery in-house for the reasons above and more. Take Groupon for example - I'd be willing to bet they do it in-house.