Broken Email Images - Possible to remove them manually from the summary digest?

Hi, our forum is currently hidden behind a firewall, and we noticed that the summary digest has broken images within (the logo / icons / topic images). My teammate has tried to remove it but it seems to still persist.

As we are not looking to have our forum open to public anytime soon, this might have to be a permanent solution and I’d like to check if there’s anyway that we can remove images from outgoing emails from the forum, especially the summary digests?

Thank you in advance! :smiley: