I was in the zoo office with the email accounts for whois accounts open, there was spam, where human ladies wanted to go out with apes from the monkey house because eating fruit is cool or something – so i submit them to spamcop together and the email back never came.
Our spam filter (my blog) did not like that and decided to scrap the email. so one and then another was sent and those did return for reporting.
I looked into the problem which was with amavis (my blog) and whitelisting fixed the issue
@bypass_spam_checks_maps = ([ qw( spam.spamcop.net ) ]);
I always take pleasure in ruining somebodies day in spammer land.