On Tue, 28 Sep 2010, Hung Phan wrote:
We are a school district which sends out legitimate messages about school information to parents but last week, we were tagged by spamrats as spammer. An important message did not reach all the subscribers because the local ISP which hosts many of our parents' emails, subscribes to spamrats as one of the anti-spam source.
I don't know anything about Spamrats, but one of the ways this happens is that some users are deciding to mark Email as spam when they no longer want to receive it, instead of unsubscribing. So it may even be a user of this very ISP which has done this.
What I recommend doing is finding out if this ISP has some kind of a feedback loop, where you can get notification of spam reports instead of them being acted upon. Spamrats might also have such a loop.
Unfortunately, to keep delivery alive to everyone, you've got to be on everyone'se feedback loop, and some people have fairly stringent requirements (e.g. Yahoo requires DKIM or SPF).
For more info, see http://www.spamhaus.org/faq/answers.lasso?section=ISP%20Spam%20Issues
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