Newsletter plugin

I just installed the plugin "newsletter" v.5.5 on my Elgg 3.3.10 It works great and will be very useful. An example.

I have detected a small problem. Everything that visualizes "online" is correct but in the received eMails part of the source "url" is cut and that causes the images not to be shown in the mail managers. By example... (correct) (Incorrect in email managers)

Can anyone help me? I don't have the technical ability to detect the plugin code error.

Thank you, Wogker.