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  2. Why can't I send mail to AOL Mail users? - AOL Help

    help.aol.com/articles/aol-mail-addresses-are-not...

    If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers. While you may be following at the rules for sending mail, it's likely the address you're sending mail from is hosted on a server our system had identified as "abusive".

  3. List of SMTP server return codes - Wikipedia

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

    C: This is a test message with 5 header fields and 4 lines in the message body. C: Your friend, C: Bob C: . S: 250 Ok: queued as 12345 C: QUIT S: 221 Bye {The server closes the connection} And below is an example of an SMTP connection in which the SMTP Server supports the Enhanced Status Code, taken from RFC 2034:

  4. List of TCP and UDP port numbers - Wikipedia

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

    This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.

  5. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made. [7] 208 Already Reported (WebDAV; RFC 5842) The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.

  6. Title 47 CFR Part 68 - Wikipedia

    en.wikipedia.org/wiki/Title_47_CFR_Part_68

    Title 47 CFR Part 68 is a section of the Code of Federal Regulations of the United States that regulates the direct electrical connection of telecommunications equipment and customer premises wiring with the public switched telephone network, certain private line services, and connection of private branch exchange (PBX) equipment to certain telecommunication interfaces.

  7. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    RFC 2228 introduced the concept of protected replies to increase security over FTP communications. The 6xx replies are Base64 encoded protected messages that serves as responses to secure commands. When properly decoded, these replies fall into the above categories.

  8. List of HTTP header fields - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_header_fields

    The domain name of the server (for virtual hosting), and the TCP port number on which the server is listening. The port number may be omitted if the port is the standard port for the service requested. Mandatory since HTTP/1.1. [17] If the request is generated directly in HTTP/2, it should not be used. [18] Host: en.wikipedia.org:8080. Host: en ...

  9. Meter serial number - Wikipedia

    en.wikipedia.org/wiki/Meter_serial_number

    The first letter indicates the manufacturer, the first two digits indicate the year the meter was calibrated and certified, and the second letter (or pair of letters) indicates the company that purchased the meter. The five/six digit sequence is a serial batch number. There may be a space separating the groups of numbers and letters.