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  2. Bounce Address Tag Validation - Wikipedia

    en.wikipedia.org/wiki/Bounce_Address_Tag_Validation

    BATV replaces an envelope sender like mailbox@example.com with prvs=tag-value=mailbox@example.com, where prvs, called "Simple Private Signature", is just one of the possible tagging schemes; actually, the only one fully specified in the draft. The BATV draft gives a framework that other possible techniques can fit into.

  3. Non-blocking algorithm - Wikipedia

    en.wikipedia.org/wiki/Non-blocking_algorithm

    A non-blocking algorithm is lock-free if there is guaranteed system-wide progress, and wait-free if there is also guaranteed per-thread progress. "Non-blocking" was used as a synonym for "lock-free" in the literature until the introduction of obstruction-freedom in 2003. [2]

  4. Python syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/Python_syntax_and_semantics

    Python sets are very much like mathematical sets, and support operations like set intersection and union. Python also features a frozenset class for immutable sets, see Collection types. Dictionaries (class dict) are mutable mappings tying keys and corresponding values. Python has special syntax to create dictionaries ({key: value})

  5. Hashcash - Wikipedia

    en.wikipedia.org/wiki/Hashcash

    For email uses, a textual encoding of a hashcash stamp is added to the header of an email to prove the sender has expended a modest amount of CPU time calculating the stamp prior to sending the email. In other words, as the sender has taken a certain amount of time to generate the stamp and send the email, it is unlikely that they are a spammer.

  6. Busy waiting - Wikipedia

    en.wikipedia.org/wiki/Busy_waiting

    In computer science and software engineering, busy-waiting, busy-looping or spinning is a technique in which a process repeatedly checks to see if a condition is true, such as whether keyboard input or a lock is available. Spinning can also be used to generate an arbitrary time delay, a technique that was necessary on systems that lacked a ...

  7. Add, edit, or disable your signature in AOL Mail

    help.aol.com/articles/add-edit-or-disable-your...

    Create a personalized email signature to automatically add to each outgoing email. This feature ensures all your AOL messages maintain a consistent, professional look with minimal effort. 1. Click the Settings Menu icon | select More Settings. 2. Click Writing email. 3. Click the Toggle button to enable or disable a signature for your email ...

  8. Non-blocking linked list - Wikipedia

    en.wikipedia.org/wiki/Non-blocking_linked_list

    A non-blocking linked list is an example of non-blocking data structures designed to implement a linked list in shared memory using synchronization primitives: Compare-and-swap; Fetch-and-add; Load-link/store-conditional; Several strategies for implementing non-blocking lists have been suggested.

  9. Manage spam and privacy in AOL Mail

    help.aol.com/articles/aol-mail-spam-and-privacy

    Select the email. Click Spam. If you're given the option, click Unsubscribe and you will no longer receive messages from the mailing list. If you click the "Mark as Spam" icon, the message will be marked as spam and moved into the spam folder.