It is surprising to read some web articles about how good the Google gmail spam filter is - in my experience, it is really poor at stopping simple spam, and also has too many false positives (email that it marks as spam but it is not spam).
There are some articles, though, about how gmail does not stop much email with "VIAGRA" in it.
On a daily basis, I have 5-10 emails with Viagra in the subject line in my gmail inbox. I don't use gmail much because of this problem - it is strange that my local spamassassin setup can easily mark this as spam, but gmail does not. I did spend a few days reporting these emails as Spam in Gmail, but to no avail - gmail will not recognize these as spam - which suggests that the Report Spam feature in gmail is also pretty much useless.
Gmail even says the message is "signed" - whatever that means. here's the gmail header:
from Approved VIAGRA Store
to avinash@aczoom.com
date Fri, Dec 18, 2009 at 12:55 PM
subject Member avinash@aczoom.com get 80% 0FF on ALL Pfizer.
mailed-by aczoom.com
signed-by aczoom.com
The same message in my local spamassassin filter is in the spam folder, and has these spam tags:
X-Spam-Status: Yes, score=13.8 required=5.0 tests=BAYES_99,HTML_IMAGE_ONLY_24,
HTML_IMAGE_RATIO_02,HTML_MESSAGE,MIME_HTML_ONLY,MISSING_DATE,MISSING_MID,
PYZOR_CHECK,RCVD_IN_PBL,RCVD_IN_SORBS_DUL,RCVD_IN_SORBS_WEB,RDNS_NONE,
SPF_NEUTRAL autolearn=no version=3.2.5
Envelope-to: avinash@aczoom.com
Delivery-date: Fri, 18 Dec 2009 10:55:56 -0700
...
Received: from [189.83.171.41] (helo=18983230136.user.veloxzone.com.br)
....