Exchange Distribution List

Scenario: I have created a distribution list called XYZ with 10 members. I have also sent email to this distributed list. An hour later I add an 11th member to the list.

Query: Will the 11th member get the email sent originally to the 10 and ifnot how can I make it possible?

Software used: Ms. Exchange 5.5 SP 4 on Ms. NT Server 4.0 SP 6