General Best E-mail app ?

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http://androidforums.com – Ok yesterday i got my G3 from Metro. I always used the K-9 email app when i had sprint but with metro it does not work well. it locks up on checking mail i'd have to reboot the phone. also when i send mail i get a stupid error and it says some messages failed to send. i only tried to send one at a tome too. my question is What is a good e-mail app to use on my G3 with metro (General)