Review: Samsung Replenish
The Replenish trods a well-worn path when it comes to messaging. It runs all the stock Android 2.2 messaging applications, and doesn't offer anything new, not even from the Sprint ID packs.
It has the generic email app for POP/IMAP/Exchange email, and the dedicated Gmail application for Google users. Both of these applications are capable and time-tested.
The stock SMS/MMS app is loaded on the Replenish, and I didn't notice any different or unusual behavior with it. It offers threaded conversations, as always.
As for IM, the Replenish has GTalk on board, and nothing else. If you use Yahoo, Windows Live or AIM, you'll have to seek out third-party apps from the Android Market.
On the social networking front, the Replenish is one of the most anemically equipped devices I've seen in a long time. All it comes with is Tweetcaster, the third-party Twitter application, and a generic, catch-all social networking application to aggregate feeds called SpringPad. If you want Facebook and the real Twitter app, you'll have to download them yourself.