The best replacement for ses is sis.

The best alternatives to ses are rated as following:
★★★★★  sis
★★★★  gs
★★★  leurs
★★  sl
★★  sendgrid
★★  smx
★★  social class
★★  finkl
★  wps
★  sel
★  se
★  se taurus
★  mandrill
★  tooway
★  gs-15
★  mailgun
★  ces
★  leur
  high ses
  rfs
  ford taurus sel
  leur leurs
  taurus se

Your alternative for ses is not listed? Suggest!
Speaking about ses, one probably shouldn't forget about postfix.

Other search terms related to ses and their ratings are:
★★★★★ postfix
You have in mind a companion for ses and it is not yet here? Propose!



Google Trends

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