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Full user review
This review was originally posted on VersionTracker.com.
I have tried every email app there is for OS X (I'm still using 10.3.11). GyazMail is, by far, the best of the bunch, in my opinion.
There is one feature request that I have asked for--several times--that the developer has so far ignored: auto delete of mail in a folder after X number of days. Other than the absence of that feature I am completely satisfied with GyazMail.