The mobile reading rate reflects the proportion of newsletters that were opened on mobile devices. The share varies greatly and also depends on the target group and the industry. The mobile read rate is particularly high among younger target groups. Values of well over 40 percent are the order of the day.
If your newsletters go to a younger target group to a large extent, you should urgently ensure that your newsletters are also optimised for mobile viewing. Responsive templates in particular, which are familiar from websites, make a lot of sense nowadays, because this increases the proportion of mobile use.