The best replacement for sender is scanner.

The best alternatives to sender are rated as following:
★★★★★  scanner
★★★★  sensor
★★★  source
★★★  from mailmessage
★★★  recipient
★★★  from email header
★★  block domain
★★  from
★  reply to all
★  email extractor
  temperature sensor
  reply to

Your alternative for sender is not listed? Suggest!
Speaking about sender, one probably shouldn't forget about opening email.

Other search terms related to sender and their ratings are:
★★★★★ opening email
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Google Trends

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sender
scanner
sensor