The best replacement for first class mail is standard mail.

The best alternatives to first class mail are rated as following:
★★★★★  standard mail
★★★★★  priority
★★★★  parcel post
★★★★  priority mail
★★  express mail
★★  regular mail
★★  certified mail
★★  ups ground
★★  media mail
★  first class package
★  usps priority
★  standard
★  standard post
  usps priority mail
  bulk mail
  prodty mail
  third class mail

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

Other search terms related to first class mail and their ratings are:
★★★★★ tracking
★★★★ delivery confirmation
★★ tracking number
★ confirmation
You have in mind a companion for first class mail and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of first class mail in all years. Click on graph for more.
first class mail
standard mail
priority