If you're sending in bulk, then you're much more likely to be a spammer. If you've got a legitimate business reason to be contacting these people, like they've

If you're sending in bulk, then you're much more likely to be a spammer. If you've got a legitimate business reason to be contacting these people, like they've bought products or services from you in the past, then you most likely do not need to be sending messages in bulk. If you're the operator of a large scale mailing list (on the order of python.org), then you might be sending messages in bulk, but still not a spammer. In that case, tuning large mailing lists to avoid being classified as a spammer is still a topic of investigation. I know that the folks at python.org have to deal with this problem on a regular basis.