[CentOS] problems with sendmail

Hi all,

 I have a problem with Sendmail in CentOS 5. I want use authentication for
external access. I configure my sendmail.mc:


TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5
LOGIN PLAIN')dnl


But when send a message, show this message:

Relaying denied. Proper authentication required.

Any idea of the error?

Thanks,

Daniel Bruno
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