It's a simple question, but Apple doesn't have an answer or want to give it: Why does the spam filter work perfectly on my MacBook, but does not work at all on my iPhone? iOS 11.4
Does iOS have a spam filter?
And if so, when did they add it?
Guessing there is no spam filter iOS, so why doesn't Apple just come out and say that?!
There is no spam filter built into 11.4.Guessing there is no spam filter iOS, so why doesn't Apple just come out and say that?!
The nerve!
It's probably because the mail program in iOS is intended to function mainly as an IMAP client where all of the real mail handling is done by the server. Whatever service you're using would then be the one that applies the spam filtering and you may need to login to it using a Webmail portal to tune it (if you can).
Is that the reason why I get spam on my iPhone but not on my MacBook? Both Comcast STMP, but not synced in iCloud.
The reason why you're not seeing spam on your MacBook is OS X Mail or whatever you're using has a client side (i.e. your computer) spam filter that scans for spam after you download your email.
On iOS, the email is probably remaining on the server and either there is nothing on the server that is filtering out spam or the spam filter is set to a very weak level.
I've never had a Comcast email address so I don't know what they provide you, but I'd guess that you do have some server based spam filtering available. If you have Webmail access, login there and see if you find any options.