How does Malvolio read the inscription?

Malvolio reads the inscription and attributes the handwriting to Olivia. The inscription reads...

“To the unknown beloved, this, and my good wishes”—Her very phrases!

By your leave, wax. Soft!

And the impressure her Lucrece, with which she uses to seal.

'Tis my lady. To whom should this be?

In other words, to my beloved, who is unaware of my love.