Email list pricing could drop as much as 25 percent in the next 3-6 months because of decreasing deliverability rates caused by changes in the way service providers plan to handle HTML emails, Worldata predicted yesterday, DM News reports. In the next 12 months, Microsoft will release a new version of Outlook that filters out HTML graphics by default, decreasing delivery rates for corporate addresses, according to Worldata, and consumer ISPs are already filtering out graphics in HTML emails unless users opt to view graphics.

As of this month, permission-based B2B email lists, the highest-priced category, dipped by $8, to $281/M, compared with July 2004. Permission-based B2C email, the second-highest-priced category, also decreased by $8 to $175/M.