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  2. Greylisting (email) - Wikipedia

    en.wikipedia.org/wiki/Greylisting_(email)

    When the source of an email is a server farm or goes out through some other kind of relay service, it is likely that a server other than the original one will make the next attempt. For network fault tolerance , their IPs can belong to completely unrelated address blocks, thereby defying the simple technique of identifying the most significant ...

  3. 2021 Facebook outage - Wikipedia

    en.wikipedia.org/wiki/2021_Facebook_outage

    Major DNS resolvers returning "SERVFAIL" status for Facebook.com. Security experts identified the problem as a Border Gateway Protocol (BGP) withdrawal of the IP address prefixes in which Facebook's Domain Name System (DNS) servers were hosted, making it impossible for users to resolve Facebook and related domain names, and reach services.

  4. X-Forwarded-For - Wikipedia

    en.wikipedia.org/wiki/X-Forwarded-For

    The general format of the field is: [2] X-Forwarded-For: client, proxy1, proxy2 where the value is a comma+space separated list of IP addresses, the left-most being the original client, and each successive proxy that passed the request adding the IP address where it received the request from.

  5. Find and remove unusual activity on your AOL account

    help.aol.com/articles/find-and-remove-unusual...

    Click any recent activity entry to view its IP address as well as the date and time it was collected. If one is drastically different from the others, remove it and change your password. Be aware that there are some legitimate reasons why your history can show unfamiliar locations, such as your mobile device detecting the wrong location or ...

  6. DNS blocking - Wikipedia

    en.wikipedia.org/wiki/DNS_blocking

    Instead of returning the valid IP address of a requested site (for example, instead of 198.35.26.96 being returned by the DNS when "www.wikipedia.org" is entered into a browser, [2] if this IP were on a block list, the DNS might reply that the domain is unknown or with a different IP address that directs to a site with a page stating that the ...

  7. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

  8. Fix problems with third-party mail applications - AOL Help

    help.aol.com/articles/why-cant-i-access-my-aol...

    Find your application's "Email Accounts" or "Account Settings" section, select your AOL Mail account, then update to your new password. If you've activated 2-step verification for your AOL account, you'll need to generate and use an "app password" to access AOL Mail from these apps.

  9. List of SMTP server return codes - Wikipedia

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

    This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. 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 ...