(1) Suppose that at first, everyone sends an email to the first person (at this time, the first person has everyone's information), and then the first person sends an email to everyone else. At this time, the information is enjoyed by * * *, and one * * sends 2(n- 1) emails.

Then, we determine a lower limit-(2).

(2) We assume that the first person to collect all other people's information is A. ..

1. In the best case, the number of messages sent at this time is n- 1.

2. In order to enjoy the information, send at least n- 1 emails (that is, one from others).

According to the above discussion, we can enjoy the information in at least 2(n- 1) emails.

The answer is 2(n- 1).