Dont Text - iPhone app to block spam text messages
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
RoboKiller - A paid application for iOS and Android users which blocks and pranks spam callers, such as scammers.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
SpamHound SMS Spam Filter - SpamHound is a reliable SMS and MMS spam filter for iOS platform that protects users from unwanted messages. Configure your filters and manage Black- and Whitelists manually. Create rules and clear your message list from undesired content easily.
Mailwasher - Over 8 million people use MailWasher as their spam filter