Reading your earlier post I'm not certain if your Spam is downloading into your inbox folder or into it's own Spam folder...
If I open up my BT Internet mail page on my PC/Laptop, Junk mail is where it should be..... in the spam folder. So no problems there.
However!
That same spam folder is being forwarded to my Iphone along with all the good email that I want. So, my spam box is working as advertised when accessed in the normal way, but causing me much angst on the Iphone!
The more I read these posts, the more I think there must be something I can do about it, as it appears to be just me that is effected! Is there a setting that I've missed? Unless of course none of you chaps get much spam in your spam box. My earlier statement of 50 per day may have been a slight exaggeration, but I would say 20 per day is probably normal.
Getting a new email address is obviously a fairly simple solution and one that I will employ if there are no other suggestions as to some settings either on the phone, BT page or Outlook that might make it go away!