Hi,
If it's the look of K9 they don't like, can I recommend K-@ Mail. K-@ Mail uses K9Mail's mail engines, but puts a modern interface on the top.
Also, the developers of K-9 Mail are working on a new version with improved GUI, called "Kaiten" (K-10...):
https://play.google.com/store/apps/details?id=com.kaitenmail.adsupported
The paid version is ad free:
https://play.google.com/store/apps/details?id=com.kaitenmail
Best,
Anton
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