Because not all junk mail gets caught by standard rules on the server. E.g. you sign up to be on the mailing list of some organization, then later decide they send you too much email, but you can't seem to get taken off their list. Retailers do this, so do political organizations. It's not "junk" exactly, and in my experience the server side filters don't catch it. This is different than the pure spam e.g. Viagra, penile enhancement, Nigerian transactions, etc. Remember iOS is being developed into a standalone OS, i.e. you may not have a Mac/PC at all, so no convenient way to access the email server and tell it what you want blocked. The processing involved on the device is easy, it just checks the sender against the list of "junk" senders that you've designated. Similar to how it is handled in Mac Mail.
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Quote de jyl
You know, Apple needs (NEEDS) to incorporate a junk mail filter in iOS Mail. This is a major need.
That's something that should be handled at the account level server side.
All your device does is retrieve mail from a mailbox.
Why introduce the overhead at the device level when it can be dealt with universally at the account level?
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