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An open mail relay is a Simple Mail Transfer Protocol (SMTP) server configured in such a way that it allows anyone on the Internet to send e-mail through it, not just mail destined to or originating from known users.
This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...
Within the Internet email system, a message transfer agent (MTA), [1] mail transfer agent, [2] or mail relay is software that transfers electronic mail messages from one computer to another using the Simple Mail Transfer Protocol. [3] In some contexts, the alternative names mail server, mail exchanger, or MX host are used to describe an MTA.
SORBS ("Spam and Open Relay Blocking System") was a list of e-mail servers suspected of sending or relaying spam (a DNS Blackhole List). It had been augmented with complementary lists that include various other classes of hosts, allowing for customized email rejection by its users.
All such figures are necessarily estimates because data about mail server share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection. Surveys probing Internet-exposed systems typically attempt to identify systems via their banner, or other identifying features. [ 1 ]
The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services. Unix -based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [ 1 ] operating system.
Real-time Blackhole List (RBL), the one for which MAPS is probably best known. Dialup Users List (DUL), blocks of addresses that include many SOHO users. Relay Spam Stopper (RSS), spam relays, e.g. hijacked servers. Open Proxy Servers (OPS), naively open SMTP servers. Non-confirming Mailing List (NML), marketers who use opt-out strategy.
SMTP (server, relay-based client and full end-to-end delivery client) POP3 (server and distributing client) IMAP4rev1 (with multiple simultaneous access to the same mailbox) PH (server, for directory lookups) Finger (server, for directory lookups) PopPass (server, for remote password changing) HTTP (server, for web-based mailing list management)
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related to: free smtp relay server list