Other list sizes studied were "micro mailers" (lists under 5,000), "small mailers" (lists of 5,000 to 24,999 and "midsize mailers" (lists of 25,000 to 99,999).
The micro mailers got read rates that averaged about 35% and click-through rates between 5% and 9%. Those results compare well to the general average of 27% and 4.4%. Weekends were the best time for click-throughs, averaging 8% to 9% versus 5% to 6% for Tuesday through Thursday.
Small mailers had average read rates and click-through rates of 27.8% and 4.7%, respectively. Friday was the best email execution day, with a 31.2% read rate and 5.3% click-through rate.
Midsize mailers had wide variations in read and click-through behavior, with Monday and Friday being the most productive days (24.4% and 3.85%) and 26.4% and 7.6%), respectively).
| Purpose of Email Campaign | Response | ||
| Average | High | Low | |
| General Marketing | 1.3 % | 25.0 % | 0.2 % |
| Market Research | 4.1 % | 21.0 % | 0.5 % |
| Sales Promotion | 1.7 % | 10.3 % | 0.1 % |
| Offline Seminar Invitation | 1.0 % | 9.2 % | 0.1 % |
| Subscription Offer | 1.4 % | 3.8 % | 0.1 % |
| Online Seminar Invitation | 1.0 % | 3.6 % | 0.0 % |