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A step by step: <a href="http://www.igeeksblog.com/how-to-block-spam-text-messages-on-iphone/" rel="ugc">http://www.igeeksblog.com/how-to-block-spam-text-messages-on-iphone/</a>
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That's for test spam. What about email spam?
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Thanks for the grade. Good luck.
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How to stop spam on iphone
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how to prevent spam on iphone

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.

AntiSpam

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.