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  2. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    If the email has other recipients located elsewhere, the client would QUIT and connect to an appropriate SMTP server for subsequent recipients after the current destination(s) had been queued. The information that the client sends in the HELO and MAIL FROM commands are added (not seen in example code) as additional header fields to the message ...

  3. Help:I have been blocked - Wikipedia

    en.wikipedia.org/wiki/Help:I_have_been_blocked

    Other methods of appeal. Help:I have been blocked. If you are blocked because of something you've done, you should not create a new account to file an appeal or continue editing. This is considered sockpuppetry and block evasion and the new account will usually be blocked. Appeals related to an existing block should be submitted as described below.

  4. Wikipedia:Open proxies - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Open_proxies

    When a Checkuser detects that an account has been using open proxies, this information may be considered when evaluating suspicions of sock puppetry or other editing abuses. If there is an appearance that an account has been using open proxies to circumvent policy, the account may be blocked.

  5. 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] Most mail server software can be ...

  6. Wikipedia:Appealing a block - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Appealing_a_block

    Afterwards, check again to see if you are still blocked. It may just be a case where the IP range used by the VPN is blocked, but the IP or range used by your actual network or connection is fine. In such cases, you should request an account to be created for you. In nearly all cases, using an account to edit Wikipedia will allow you to do so ...

  7. Block and unblock email addresses in AOL Mail - AOL Help

    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.

  8. Server Name Indication - Wikipedia

    en.wikipedia.org/wiki/Server_Name_Indication

    Server Name Indication ( SNI) is an extension to the Transport Layer Security (TLS) computer networking protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process. [ 1] The extension allows a server to present one of multiple possible certificates on the same IP address and TCP ...

  9. 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.