The best replacement for boomerang is right inbox.

The best alternatives to boomerang are rated as following:
★★★★★  right inbox
★★★★★  followup.cc
★★★★  evomail
★★★★  jamman
★★★★  cartoon network
★★★★  rc 300
★★★★  yesware
★★★  mailbox
★★★  captain boomerang
★★★  pigtronix
★★  jamrud
★★  rc-50
  boss rc 50
  fap turbo
  frisbee

Your alternative for boomerang is not listed? Suggest!
Speaking about boomerang, one probably shouldn't forget about cartoon network.

Other search terms related to boomerang and their ratings are:
★★★★★ cartoon network
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Google Trends

Scale is based on the average worldwide traffic of boomerang in all years. Click on graph for more.
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