What's the best day to send out your emails to customers? My friends at Eroi have just release an interesting report analysing the opening rates day by day and by list size.
"In Q3 of 2005 we notice that the middle of the week is the low point, as far as read and click statistics go. Noticeable high points in the week occur on Sunday and Friday for both stats. So from this quarter we reaffirm again that sending volume is inversely related to how reads and clicks are going to react with the one exception of Saturday.
You can download it for free here (opens .pdf).