whitelisting sigs?

I'm testing Razor for the first time. Sorry if this is a FAQ

I ran razor-check on a mailbox full of known spam and I
was impressed that it detected all the spam.

However, I also ran razor-check on my mailbox (/var/mail/username)
and I got 3 false positives.  The 3 e-mails have in common that
they have a sig with a URL  n_c_t_t_a.o_r_g  (without the underscores)
a sports organization I've been dealing with.

Debugging shows

[ 6] mail 1.0 e=8 sig=1toyQcp91qEA: Is spam: cf 100 >= min_cf 6
[ 7] method 4: mail 1.0: no-contention part, spam=1
[ 7] method 4: mail 1: a non-contention part was spam, mail spam
[ 3] mail 1 is known spam.

I've sent revokes for each of the false-positives but I guess it
won't take effect as I'm not a trusted user yet.

How can I whitelist the sigs of false positives?
I tried adding "sha1 1toyQcp91qEA" to .razor/razor-whitelist
but it does not make a difference.

Thanks for any hints, URL's etc

Oscar


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