I will vouch for Maildroid 100%
i have a ornage barcelon and wanted a email app since the built ib one doesnt work properly with Yahoo.
I previously owned a nokia E71 and had the client seven communication which was a very good push email client,unfortunately they dont do email clients for android. I think they have moved away from email.
i searched and installed most email providers mentioned on several forums before installing Maildroid. it is an honest pleasure to use maildroid. I have the free version though but it works without a fault. Once i change my phone to a faster one proberbly the samsung galaxy note i will get the paid version of maildroid as it a much better than the ones out there 100%