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  2. List of SMTP server return codes - Wikipedia

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

    535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3] 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons) 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded ...

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status codes indicates the action requested by the client was received, understood, and accepted. [2] 200 OK Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource.

  4. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure.

  5. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers define the following HTTP substatus codes to indicate a more specific cause of a 404 error: 404.0 – Not found. 404.1 – Site Not Found. 404.2 – ISAPI or CGI restriction. 404.3 – MIME type restriction. 404.4 – No handler configured. 404.5 – Denied by request filtering configuration.

  6. Use AOL Official Mail to confirm legitimate AOL emails

    help.aol.com/articles/what-is-official-aol-mail

    If you get a message that seems like it's from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Certified Mail, it might be a fake email. Make sure you immediately mark it as spam and don't click on any links in the email.

  7. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  8. List of email subject abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_email_subject...

    Used with a time indicator to inform the recipient that the sender needs a reply within a certain deadline, e.g. RB+7 meaning Reply By one week (7 days). RLB, meaning Read later. Used when sending personal or informational email to a business email address. Immediate response not required. RR, meaning Reply Requested or Reply Required. The ...

  9. List of TCP and UDP port numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

    [7] 2: Assigned: compressnet (Management Utility) [3] 3: Assigned: compressnet (Compression Process) [3] 5: Assigned: Remote Job Entry [8] was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5 [9] and IANA has assigned both TCP and UDP 5 to it. 7: Yes: Echo Protocol [10] [11] 9 Yes: Yes [12] Assigned ...