You cannot say: I´ve read the letter that was safely kept, because the boss had gone at that moment.
You must say: I´ve read the letter, which was safely kept, because the boss had gone at that moment.
In non-defining clauses, you cannot use ‘that’ instead of who, whom or which.
Well, I don’t make the rules myself, and I agree with Vicente that the first sentence doesn’t sound too bad.
But, Maramaras, you learned your lesson well, and the second sentence is certainly correct, and therefore better.
Ciao,
Frank.
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beste groeten - sincères salutations - kindest regards - atentamente - mit freundlichen Grüßen
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