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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. Most mail server software can be configured to check such lists, typically rejecting or flagging messages from such sites. A DNSBL is a software mechanism, rather than a specific list or policy. Dozens of DNSBLs exist. They use a wide array of criteria for listing and delisting addresses. These may include listing the addresses of zombie computers or other machines being used to send spam, Internet service providers (ISPs) who willingly host spammers, or those which have sent spam to a honeypot system. Since the creation of the first DNSBL in 1998, the operation and policies of these lists have frequently been controversial, both in Internet advocacy circles and occasional ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mail Server
Within the Internet email system, a message transfer agent (MTA), mail transfer agent, or mail relay is software that transfers electronic mail messages from one computer to another using the Simple Mail Transfer Protocol. In some contexts, the alternative names mail server, mail exchanger, or MX host are used to describe an MTA. Messages exchanged across networks are passed between mail servers, including any attached data files (such as images, multimedia, or documents). These servers often keep mailboxes for email. Access to this email by end users is typically either by webmail or an email client. Operation A message transfer agent receives mail from either another MTA, a mail submission agent (MSA), or a mail user agent (MUA). The transmission details are specified by the Simple Mail Transfer Protocol (SMTP). When a recipient mailbox of a message is not hosted locally, the message is relayed, that is, forwarded to another MTA. Every time an MTA receives an email message, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Open Relay Behavior-modification System
Open Relay Behavior-modification System (ORBS), created and run by Alan Brown in New Zealand, was one of the first DNS-based Blackhole Lists (DNSBL), a means by which an internet domain may publish a list of IP addresses, in a database which can be easily queried automatically by other computer programs on the Internet. The ORBS list was used to blacklist IP addresses that were open mail relays, third-party mail servers through which spammers can relay their messages and thus attempt to obfuscate the source of the spam. Controversy The ORBS list was controversial for a number of reasons. Many people felt that the methods ORBS employed to scan the Internet for open mail servers could be abusive. ORBS used probes to test for open relays without permission, sometimes over and over again. Some claimed that testing of their networks continued even after they asked ORBS to stop, others claimed that relayed spam didn't stop either. In some cases the tests interfered with mail servers, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loopback
Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification. It is primarily a means of testing the communications infrastructure. Loopback can take the form of communication channels with only one communication endpoint. Any message transmitted by such a channel is immediately and only received by that same channel. In telecommunications, loopback devices perform transmission tests of access lines from the serving switching center, which usually does not require the assistance of personnel at the served terminal. Loop around is a method of testing between stations that are not necessarily adjacent, wherein two lines are used, with the test being done at one station and the two lines are interconnected at the distant station. A patch cable may also function as loopback, when applied manually or automatically, remotely or locally, facilitating a loop-back test. Where a syst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of DNS Server Software
This article presents a comparison of the features, platform support, and packaging of many independent implementations of Domain Name System (DNS) name server software. Servers compared Each of these Domain Name System, DNS servers is an independent implementation of the DNS protocols, capable of resolving DNS names for other computers, publishing the DNS names of computers, or both. Excluded from consideration are single-feature DNS tools (such as proxies, filters, and firewalls) and redistributions of servers listed here (many products repackage BIND, for instance, with proprietary user interfaces). DNS servers are grouped into several categories of specialization of servicing domain name system queries. The two principal roles, which may be implemented either uniquely or combined in a given product are: * Authoritative server: authoritative name servers publish DNS mappings for domains under their ''authoritative'' control. Typically, a company (e.g. "Acme Example Widgets" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hotmail
Outlook.com, formerly Hotmail, is a free personal email service offered by Microsoft. It also provides a webmail interface accessible via web browser or mobile apps featuring mail, Calendaring software, calendaring, Address book, contacts, and Task management, tasks services. Outlook can also be accessed via email clients using the Internet Message Access Protocol, IMAP or Post Office Protocol, POP protocols. Founded in 1996 by Sabeer Bhatia and Jack Smith (Hotmail), Jack Smith as Hotmail, it was acquired by Microsoft in 1997 for an estimated $400 million'','' with it becoming part of the MSN family of online services, branded as MSN Hotmail. In May 2007, the service was rebranded to Windows Live Hotmail, as part of the Windows Live suite of products. It was changed back to Hotmail in October 2011 and was fully replaced by Outlook in May 2013, sharing the same brand as the Microsoft Outlook software which is offered via a Microsoft 365 (formerly Microsoft Office) subscription. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |