I contacted DreamHost support regarding Spam several months ago. They suggested blacklisting addresses and domains frequently. That doesn’t/isn’t going to/will not work for reasons that should be obvious. It is good that they are using some Spam filtering but, it is obviously not enough for some of our email addresses for some reason.
Here are a couple of extracts from Spam email headers:
X-DH-Virus-Scanned: Debian amavisd-new at madmax.dreamhost.com
X-Spam-Status: No, score=-1.05 tagged_above=-999 required=0
tests=[HTML_MESSAGE=0.001, RP_MATCHES_RCVD=-1.051] autolearn=disabled
X-DH-Virus-Scanned: Debian amavisd-new at diehard.dreamhost.com
X-Spam-Status: No, score=-0.009 tagged_above=-999 required=0
tests=[HTML_MESSAGE=0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=disabled
My mail server is homiemail-sub5.
I think a collaberative Spam reporting system would help. I think it’d also help to turn on autolearning but there must be a good reason why it is off.
I found it helped to set my quarantine level to .01 (note the decimal point). I used to be able to set it to a negative number which helped but, we can no longer do that. The system will also not accept 0 for a value. The lowest it can be set is .01.
I would love to use a whitelist system and block all other mail but it won’t work when spam can still get by the quarantine level with negative numbers.
As for mail filtering … It works as long as you are willing to keep the list meticulously updated with the ever changing varieties of Spam that cross your path. I currently have an email filter list with over 50 filters in it based on the “From” field. In the last round of Spam I found that field had the most consistant info in it. In the most recent round the “From” field isn’t very consistant so I can rarely use it to filter the Spam.