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  2. Fix problems sending AOL Mail - AOL Help

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

    Check your display name: If you have any combination of "AOL" in your display name, the message won't go through. It is especially important to check your Mail settings for this if your account has been recently compromised, as hackers will often change your name to make it harder for you to use your account normally even after it's secured.

  3. Fix problems reading or receiving AOL Mail - AOL Help

    help.aol.com/articles/fix-problems-reading-or...

    Clear your browser's cache to reset your browser and wipe out all the little unwanted bits of info that have been stored, making it overall run better. Fix problems with missing emails When emails go missing in AOL Mail, it's often due to a few simple things; either the message is in the wrong folder, your third-party mail client's settings, or ...

  4. 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".

  5. Cut-through switching - Wikipedia

    en.wikipedia.org/wiki/Cut-through_switching

    A cut-through switch will forward corrupted frames, whereas a store and forward switch will drop them. [5] Fragment free is a variation on cut-through switching that partially addresses this problem by assuring that collision fragments are not forwarded. Fragment free will hold the frame until the first 64 bytes are read from the source to ...

  6. Switching loop - Wikipedia

    en.wikipedia.org/wiki/Switching_loop

    Switching loops can cause misleading entries in a switch's media access control (MAC) database and can cause endless unicast frames to be broadcast throughout the network. A loop can make a switch receive the same broadcast frames on two different ports, and alternatingly associate the sending MAC address with the one or the other port.

  7. List of SMTP server return codes - Wikipedia

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

    214 Help message (A response to the HELP command) 220 <domain> Service ready 221 <domain> Service closing transmission channel 221 2.0.0 Goodbye [1] 235 2.7.0 Authentication succeeded [3] 240 QUIT 250 Requested mail action okay, completed 251 User not local; will forward 252 Cannot verify the user, but it will try to deliver the message anyway

  8. Forwarding information base - Wikipedia

    en.wikipedia.org/wiki/Forwarding_information_base

    A forwarding information base (FIB), also known as a forwarding table or MAC table, is most commonly used in network bridging, routing, and similar functions to find the proper output network interface controller to which the input interface should forward a packet. It is a dynamic table that maps MAC addresses to ports.

  9. Port forwarding - Wikipedia

    en.wikipedia.org/wiki/Port_forwarding

    Local port forwarding is the most common type of port forwarding. It is used to let a user connect from the local computer to another server, i.e. forward data securely from another client application running on the same computer as a Secure Shell (SSH) client. By using local port forwarding, firewalls that block certain web pages, can be ...