The best replacement for k9 is maildroid.

The best alternatives to k9 are rated as following:
★★★★★  maildroid
★★★★  p9
★★★  a215
★★★  net nanny
★★★  touchdown
★★★  k-9
★★  mk9
★★  blind fury
★★  cloudmagic
★★  canine
★★  aqua mail
★  pug
★  sig 239
★  walter
★  covenant eyes
★  cw9
★  k40
★  joey hernandez
★  frontline plus
★  sig p239
★  opendns
★  k9
★  improved email
  k 9
  walter wright
  bully max
  kaiten
  ishe
  joel julio
  t9

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Google Trends

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k9
maildroid
p9