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Thunderbird: Why is there an eye for this message in my message list?

This is Thunderbird 45.8.0. In one of my email accounts, one message I received and replied today has an eye in its column where we see the "+" do expand or contract threads and discussions. Right now I checked that the other message I received from that person also has an eye there.

What is the meaning of that?

  1.a. Você quer fazer um comentário, mas não quer mostrar
       quem você é?
  1.b. Do you want to make a comment for me, but do not want
       to show who you are?

  2.a. Você pode fazê-lo aqui:
  2.b. You may do it here:

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