qmail log -99.9/3.5

[vags]

Hi
Today I found log entries on one of the qmail servers

qm05 splogger: 1279603979.687243 delivery 7849: success: -99.9/3.5/did_0+0+2/
qm05 splogger: 1279603979.687243 delivery 7849: success: -96.5/3.5/did_0+0+2/

It says sucess but this particular mail was not sent at all.

I don't really understand the 99.9/3.5 and -96.5/3.5 part.

Really need help.

Thanks in advance.