How to send png graphics using mailreporter?

[Akane]

I'm new into PfSense and now i'm trying to learn about mail reporting. I'm using BandwidthD to get information about my statistics, but how can i send the graphic that BandwidthD generates using mailreporter? I know that it's located at /usr/local/bandwidthd/htdocs but how can I send it as a image to my mail using mailreporter?