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2. International email - Wikipedia

   en.wikipedia.org/wiki/International_email

   International email arises from the combined provision of internationalized domain names ( IDN) [1] and email address internationalization ( EAI ). [2] The result is email that contains international characters (characters which do not exist in the ASCII character set), encoded as UTF-8, in the email header and in supporting mail transfer ...

3. Email address - Wikipedia

   en.wikipedia.org/wiki/Email_address

   The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and ...

4. Universal Acceptance - Wikipedia

   en.wikipedia.org/wiki/Universal_Acceptance

   This expansion of the Domain Name System’s Root Zone further exacerbated challenges associated with universal acceptance of these domain names. For the principles of Universal Acceptance to be realized, all valid domain names and email addresses must be accepted, validated, stored, processed and displayed correctly and consistently by all ...

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

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

   Fix problems with third-party mail applications. If you're having problems accessing AOL Mail through third-party applications, such as Outlook or Thunderbird, try troubleshooting with these suggestions to make sure your email works where and when you need it.

6. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [1]

7. List of SMTP server return codes - Wikipedia

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

   X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .

8. DomainKeys Identified Mail - Wikipedia

   en.wikipedia.org/wiki/DomainKeys_Identified_Mail

   DomainKeys Identified Mail ( DKIM) is an email authentication method designed to detect forged sender addresses in email ( email spoofing ), a technique often used in phishing and email spam . DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [1]

9. Fully qualified domain name - Wikipedia

   en.wikipedia.org/wiki/Fully_qualified_domain_name

   Fully qualified domain name. A fully qualified domain name ( FQDN ), sometimes also referred to as an absolute domain name, [1] is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS). It specifies all domain levels, including the top-level domain and the root zone. [2]