Cannot forward message

I became victim of a financial scam and in its wake I received a criminal spam that I wished to report to Spamcop.net for which I need to forward the spam as attachment to their report email address submit.AvCdHodVnRzMqEQN@spam.spamcop.net

Trying this I receive a notification by my k9-app that this (spam) email cannot be forwarded!

I guess the spam is a very sophisticated one.

I’m using the K9-app on a Redmi 11s phone with recently (unfortunately!) updated operating system.

Update: Meanwhile I followed ChatGPT’s recommendation to use a different client to forward the spam to Spamcop.net. I’m glad to have been able to use the FairEmail app successfully to report the above malicious spam of a criminal organization. By the way my k9-app only showed a completely manipulated header that also didn’t work when I tried to manually report the spam to Spamcop.net! The header shown by k9 was about 20 times smaller than the one shown by FairEmail!

Thank you for reading and helping each other!

I hope someone can make use of my experience shared.