The best replacement for touchdown is k9.

The best alternatives to touchdown are rated as following:
★★★★★  k9
★★★★★  moxier
★★★★  touchdown hd
★★★  roadsync
★★★  activesync
★★★  mail+
★★★  moxier mail
★★  maildroid
★★  aqua mail
★★  android email
★★  divide
★★  companionlink
★  enhanced email
★  improved email
★  no touchdown
★  touchdown
★  roundup
★  interception
★  field goal
  corporate sync
  good for enterprise
  touch down
  touchback
  android exchange

Your alternative for touchdown is not listed? Suggest!
Speaking about touchdown, one probably shouldn't forget about band on the field.

Other search terms related to touchdown and their ratings are:
★★★★★ band on the field
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Google Trends

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touchdown
k9
moxier