Deliverability

Deliverability

I have been doing a regular email weekly for the last 6 months.

During this time, the open rate is consistently around 20%, representing 500+ opens on the list. It has been as high as 700.

These last 2 weeks, this has dropped to 300, so almost halved, I cannot see why this is the case. Do you have any ideas?

this makes no sense to me