X-Authentication-warning error.

[Gerard O'Donnell]

Hiya's Everyone.

X-Authentication-Warning: localhost.localdomain: gerard owned process
doing -bs

...while its not a biggie, as things are still funcitonal, anyone got any
bright ideas as to why every mail I send out of this system has that
authentication tag tacked onto it, and perhaps more importantly, how I
might go about getting rid of it?