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2. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   A reverse DNS lookup is a DNS query for the domain name associated with a given IP address. This accomplishes the opposite of the more-commonly-used forward DNS lookup, in which the DNS is queried to return an IP address. ^ a b "RFC 1035 — Domain names - implementation and specification". November 1987.

3. WHOIS - Wikipedia

   en.wikipedia.org/wiki/WHOIS

   WHOIS. WHOIS (pronounced as the phrase "who is") is a query and response protocol that is used for querying databases that store an Internet resource's registered users or assignees. These resources include domain names, IP address blocks and autonomous systems, but it is also used for a wider range of other information.

4. Use POP or IMAP to sync AOL Mail on a third-party app or ...

   help.aol.com/articles/how-do-i-use-other-email...

   There are two different protocols you can choose when setting up a third-party email app: POP or IMAP. POP downloads a copy of your emails from your account (mail.aol.com) to the app. This means that if you delete an email from your account after it's been downloaded, the downloaded copy remains in the app. Additionally, POP only downloads ...

5. Email authentication - Wikipedia

   en.wikipedia.org/wiki/Email_authentication

   Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message. The original base of Internet email, Simple Mail Transfer ...

6. Block and unblock email addresses in AOL Mail

   help.aol.com/articles/block-and-unblock-email...

   Block email addresses. 1. Open an email or select it from your mailbox. 2. Click the More icon. 2. Click Block Senders. 2. Optionally, select to also delete emails you've received from the sender.

7. Comparison of webmail providers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_webmail...

   The following tables compare general and technical information for a number of notable webmail providers who offer a web interface in English.. The list does not include web hosting providers who may offer email server and/or client software as a part of hosting package, or telecommunication providers (mobile network operators, internet service providers) who may offer mailboxes exclusively to ...

8. DMARC - Wikipedia

   en.wikipedia.org/wiki/DMARC

   DMARC. Domain-based Message Authentication, Reporting and Conformance (DMARC) is an email authentication protocol. It is designed to give email domain owners the ability to protect their domain from unauthorized use, commonly known as email spoofing. The purpose and primary outcome of implementing DMARC is to protect a domain from being used in ...

9. Email hosting service - Wikipedia

   en.wikipedia.org/wiki/Email_hosting_service

   Free Email Services using a public domain such as Gmail; Yahoo. These are more suitable for individual and personal use. Shared Hosting Email Services are large mailboxes that are hosted on a server. People on a shared hosting email service share IP addresses as they are hosted on the same server.