The best replacement for yahoo mail is gmail.

The best alternatives to yahoo mail are rated as following:
★★★★★  gmail
★★★★  hotmail
★★★★  google mail
★★  yahoo mail plus
★★  outlook
★  ymail
★  mail plus
★  gmail security
★  outlook express
★  google
  yahoo mail classic
  yahoo messenger
  microsoft outlook
  yahoo plus
  windows live mail
  msn hotmail
  aol mail
  g mail
  outlook com
  y mail

Your alternative for yahoo mail is not listed? Suggest!
Speaking about yahoo mail, one probably shouldn't forget about outlook.

Other search terms related to yahoo mail and their ratings are:

★★★★★ outlook
★★★★ outlook 2007
★★★★ outlook express
★★★ thunderbird
★★★ outlook 2010
★★ mac mail
★★ outlook 2013
★★ ssl
★★ outlook 2003
apple mail
my own domain
windows mail
windows live mail
microsoft outlook
You have in mind a companion for yahoo mail and it is not yet here? Propose!

Google Trends

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