The best replacement for postbox is thunderbird.

The best alternatives to postbox are rated as following:
★★★★★  thunderbird
★★★★  mail
★★★  airmail
★★★  apple mail
★★  outlook
★★  sparrow
★★  mail.app
★★  cheese
★★  unibox
★  mailbird
★  em client
★  outlook 2013
★  windows live mail
★  mailmate
  postbox express
  eudora
  opera mail
  mailplane

Your alternative for postbox is not listed? Suggest!


No companions for postbox have been suggested so far.
You have in mind a companion for postbox and it is not yet here? Propose!



Google Trends

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