Is the info that's put into the mail headers a security risk?

[damainman]

Today while testing out some emails, i noticed that the users Cpanel account name is inserted into the headers.

I sent a email from SquirrelMail on my server, to a aol account. When looking in the header i noticed this:

Received: from CPANELACCOUNTNAME by server.mydomain.net with local (Exim 4.42)

Wouldn't inserting the account name used to log into cpanel create a security risk, or is it not that serious?

[elleryjh]

Well it exposes the user name, so a cracker is one step closer to brute forcing on that account, but tracing spam is made much easier with this info.