Jupiter Research reports that more than half of email marketers fail to check whether or not users are receiving their mass communications. Fully 54 percent report that they don't audit their emailings to diagnose delivery issues, except after a campaign has already gone out. Two thirds of marketers who do their own email marketing in-house fail to institute ongoing auditing processes. The report stressed the importance of inbox seeding, scoring content for its likelihood to get flagged by spam filters, message rendering quality control and blacklist monitoring.