The best replacement for postini is barracuda.

The best alternatives to postini are rated as following:
★★★★★  barracuda
★★★★  ironport
★★★  spamassassin
★★★  forefront
★★★  mimecast
★★  proofpoint
★★  mcafee saas
★★  brightmail
★★  messagelabs
★★  google vault
★★  mx logic
★  gfi
★  fope
★  symantec cloud
★  frontbridge
  appriver
  forefront online

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Google Trends

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