When can I go in the bullpen?

Hint 1 of 5:

You must be invited in.

Hint 2 of 5:

When Therese decides you are ready, she will invite you to follow her.

Hint 3 of 5:

Now the bouncer needs proof.

Hint 4 of 5:

Have you read your mail today?

Hint 5 of 5:

Therese mailed you a note and signed her name.