The first hint to crack the puzzle "Send a mail you've received on to someone else" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "Send a mail you've received on to someone else" is:

It starts with letter f

The third hint to crack the puzzle "Send a mail you've received on to someone else" is:

It ends with letter d

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The answer for the puzzle "Send a mail you've received on to someone else" is: