[replicatorblog]

Constant Contact was another competitor, providing basically the same service, they recently sold for a billion dollars while MailChimp grew alongside them. If the market is big enough, it can support multiple companies.

[davewritescode]

They target totally different markets. Constant Contact is a superior product for the less technically literate crowd. The hacker news crowd probably isn't their target customer. I think live support is their key differentiator.