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  2. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative may be provided.

  3. Fix problems sending AOL Mail

    help.aol.com/articles/aol-mail-troubleshooting

    If your contacts are getting emails you didn't send, your sent folder is full of messages you didn't send, or you're missing folders, it could be a sign that your account has been compromised or hacked. If you notice these signs, you may also end up having problems with sending or composing mail.

  4. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not [note 1] send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions. 100 Continue

  5. Cleancode eMail - Wikipedia

    en.wikipedia.org/wiki/Cleancode_email

    Cleancode eMail [1] (also known as CleanCode Email [2] or simply email [4] [5]) is a simple command line software utility for sending SMTP email. [5] It is portable enough to compile and run under Linux , [ 2 ] OS X , [ 2 ] BSD , Solaris , Cygwin and perhaps other Unix -like operating systems.

  6. Message passing - Wikipedia

    en.wikipedia.org/wiki/Message_passing

    In computer science, message passing is a technique for invoking behavior (i.e., running a program) on a computer.The invoking program sends a message to a process (which may be an actor or object) and relies on that process and its supporting infrastructure to then select and run some appropriate code.

  7. Sieve (mail filtering language) - Wikipedia

    en.wikipedia.org/wiki/Sieve_(mail_filtering...

    Sieve is a data-driven programming language, similar to earlier email filtering languages such as procmail and maildrop, and earlier line-oriented languages such as sed and AWK: it specifies conditions to match and actions to take on matching.

  8. HTTP - Wikipedia

    en.wikipedia.org/wiki/HTTP

    An HTTP/1.1 request made using telnet. The request message, response header section, and response body are highlighted. HTTP defines methods (sometimes referred to as verbs, but nowhere in the specification does it mention verb) to indicate the desired action to be performed on the identified resource. What this resource represents, whether pre ...

  9. Message authentication code - Wikipedia

    en.wikipedia.org/wiki/Message_authentication_code

    In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating and integrity-checking a message. In other words, it is used to confirm that the message came from the stated sender (its authenticity) and has not been changed (its integrity).