Years ago, I found that a disposable email service Guerrilla Mail was adding IPs from x-forwarded-for to outgoing emails blindly, which could have been abused t

Years ago, I found that a disposable email service Guerrilla Mail was adding IPs from x-forwarded-for to outgoing emails blindly, which could have been abused to make it look like any IP you wanted had sent an email https://voidnet.tech/chaos/blog/do-not-trust-x-forwarded-for.html https://voidnet.tech/chaos/blog/do-not-trust-x-forwarded-for...