Potential answers for "Opening of some formal letters"

⭐⭐⭐⭐ SIRS
⭐⭐ CRITICS
⭐⭐ SWAK
⭐⭐ ATTN
⭐⭐ RSVP
⭐⭐ MAILSLOT
⭐⭐ PPS
⭐⭐ FLAP
⭐⭐ SEMI

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Part of N.H.L.   X-rayed, e.g.   Tipped off