Apparently, almost all bulk mail senders that claim to be legitimate have established a standard acceptable use policy. The following questions are taken verbatim from one of them.
* Are you sending email to non-specific addresses, such as email@example.com or firstname.lastname@example.org?
* Have you deliberately falsified your transmission path information or originating address?
* Are you sending email to mailing lists or distribution lists, which then send indirectly to various other email addresses?
* Have you imported for use a purchased list of any type?
* Are you continuing to mail to anyone who has asked to be deleted from your mailing list?
* Does your email not provide a fully functioning link to unsubscribe?
* Does you email subject line contain false or misleading information?
* Have you used a third partyâ€™s email address or domain name without the partyâ€™s consent?
If you answer yes to any of these questions, then you are likely involved in spam activities. These are my own additions to those questions:
* Do you harvest email addresses from web sites, newsgroups, mailing lists, and/or other sources without any knowledge from the owner of email addresses in question?
* Are you sending your emails without express consent from the owner of email address in question?