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  2. TXT record - Wikipedia

    en.wikipedia.org/wiki/TXT_record

    The DNS protocol specifies that when a client queries for a specific record type (e.g., TXT) for a certain domain name (e.g., example.com), all records of that type must be returned in the same DNS message. That may lead to large transactions with lots of "unnecessary" information being transferred and/or uncertainty about which TXT record to use.

  3. Reverse DNS lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_DNS_lookup

    Some anti-spam filters assume that email that originates from such addresses is likely to be spam, and may refuse connection. [6] [7] A forward-confirmed reverse DNS (FCrDNS) verification can create a form of authentication showing a valid relationship between the owner of a domain name and the owner of the server that has been given an IP address.

  4. Domain Name System blocklist - Wikipedia

    en.wikipedia.org/wiki/Domain_Name_System_blocklist

    A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host's IP address is blacklisted for email spam. [1]

  5. Wildcard DNS record - Wikipedia

    en.wikipedia.org/wiki/Wildcard_DNS_record

    A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither intuitive nor clearly ...

  6. 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 ...

  7. nslookup - Wikipedia

    en.wikipedia.org/wiki/Nslookup

    nslookup operates in interactive or non-interactive mode. When used interactively by invoking it without arguments or when the first argument is - (minus sign) and the second argument is a hostname or Internet address of a name server, the user issues parameter configurations or requests when presented with the nslookup prompt (>).

  8. Fix problems reading or receiving AOL Mail

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

    Check your account email client. One of the top reasons a user can't find their emails is due to settings from a third-party email client such as Outlook or the Mail app on your phone. Chances are the settings in the program are set to delete the emails from the AOL server each time you check your mail.

  9. Spam and Open Relay Blocking System - Wikipedia

    en.wikipedia.org/wiki/Spam_and_Open_Relay...

    In order to prevent being blacklisted, major free email services such as Gmail, Yahoo, and Hotmail, as well as major ISPs now implement outgoing anti-spam countermeasures. Gmail, for example, continues to get listed and delisted [ 9 ] [ 10 ] because they refuse abuse reports. [ 11 ]

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