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- Nothing - Some mail domains will not get enough spam for us, or will not have thresholds set to block the tufts domain (or we may be on their whitelist!) and no action is taken
- Temporary Blacklisting - some mail services will place us on a brief hold (anywhere from 24hrs to 4 weeks) and then we are automatically allowed to email them again
- Time shift temporary blacklisting - This works similarly to temporary listing, but we're only blacklisted for a shorter period of time from the LAST spam event, so it may be 24 hours after the last spam event is recieved
- Blacklist (single host) some services will blacklist JUST the smtp relay that sent to them, which gives the impression that "some mail goes through, some doesn't"
- Blacklist via service - some recipient domains are members of trust organizations, that will monitor their receipts. Getting whiteliested or de-listed from those trust organizations will return service
- Blacklist via recipient domain - some recipient domains keep their own black-list or augment their trust organizations with their own list.
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