On Sun, 2 Sep 2001, Nomen Nescio wrote:

The fact that a given person is using the remailer network is not a secret. At least one remailer finds out every time he sends a message. The point is, the entry from the non-anonymous to the anonymous world is a vulnerability.

Unless you run a remailer yourself. The fact that I use anonymous remailers would be hard to deny, if am a remailer operator. However, if I make my own remailer first in the chain, an attacker sitting at the second remailer will not be able to tell when I am using my remailer myself vs. when it is being used by others vs. dummy cover traffic.