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Internet protocol used for relaying e-mails
The Simple Mail Transfer Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message
Simple_Mail_Transfer_Protocol
Computer network protocol
The Local Mail Transfer Protocol (LMTP) is an alternative to (Extended) Simple Mail Transfer Protocol for situations where the receiving side does not
Local_Mail_Transfer_Protocol
Software to transfer electronic mail
computer to another using the Simple Mail Transfer Protocol. In some contexts, the alternative names mail server, mail exchanger, or MX host are used
Message_transfer_agent
Messaging protocol for web services
application layer protocols, most often Hypertext Transfer Protocol (HTTP), although some legacy systems communicate over Simple Mail Transfer Protocol (SMTP),
SOAP
Mail sent using electronic means
submission protocol, a profile of the Simple Mail Transfer Protocol (SMTP), to send the message content to the local mail submission agent (MSA), in this case
Identifier of the destination where email messages are delivered
transmission of electronic mail from the sender's computer and between mail hosts in the Internet uses the Simple Mail Transfer Protocol (SMTP), defined in RFC 5321
Email_address
Automated message from an email system
Mail (DKIM) Sender Rewriting Scheme (SRS) Simple Mail Transfer Protocol (SMTP) Variable envelope return path (VERP) RFC 5321 - Simple Mail Transfer Protocol
Bounce_message
Forwarding email address
Retrieved 2026-03-22. Simple Mail Transfer Protocol (SMTP). IETF. 2008. sec. 2.1. doi:10.17487/RFC5321. RFC 5321. Simple Mail Transfer Protocol (SMTP). IETF.
Email_alias
became the world's largest selling email system. The Simple Mail Transfer Protocol (SMTP) protocol was implemented on the ARPANET in 1983. LAN email systems
History_of_email
Rewriting an email message sender address
format. Historically, all mail transfer agents (MTAs) added their host name to the reverse path. In the Simple Mail Transfer Protocol (SMTP) this reverse path
Sender_Rewriting_Scheme
Computer network protocol
connected to local networks. The resulting protocol was NNTP, which resembled the Simple Mail Transfer Protocol (SMTP) but was tailored for exchanging newsgroup
Network News Transfer Protocol
Network_News_Transfer_Protocol
Method for securing email with transport layer security
SMTPS (Simple Mail Transfer Protocol Secure) is a method for securing the SMTP using transport layer security. It is intended to provide authentication
SMTPS
Techniques aimed at providing verifiable information about the origin of email messages
of email submission and retrieval. In the early 1980s, when Simple Mail Transfer Protocol (SMTP) was designed, it provided for no real verification of
Email_authentication
Voice-over-IP communications protocol
is a text-based protocol, incorporating many elements of the Hypertext Transfer Protocol (HTTP) and the Simple Mail Transfer Protocol (SMTP). A call established
Session_Initiation_Protocol
Multipurpose Internet Mail Extensions
standard protocols, such as the Simple Mail Transfer Protocol (SMTP), the Post Office Protocol (POP), and the Internet Message Access Protocol (IMAP).
MIME
SMTP server that allows anyone to send e-mail through it
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
Open_mail_relay
cooperates with a mail transfer agent (MTA) for delivery of the mail. It uses ESMTP, a variant of the Simple Mail Transfer Protocol (SMTP), as specified
Message_submission_agent
Type of Internet domain name
hostnames are allowed by some protocols, including HTTP, but disallowed by others, such as the Simple Mail Transfer Protocol (SMTP). Mockapetris, Paul. Domain
Fully_qualified_domain_name
Highest layer in network protocol models
Message Block SMTP, Simple Mail Transfer Protocol SNTP, Simple Network Time Protocol SSH, Secure Shell SSMS, Secure SMS Messaging Protocol TCAP, Transaction
Application_layer
Provider of email hosting
by implementing Simple Mail Transfer Protocol (SMTP) and possibly providing access to messages through Internet Message Access Protocol (IMAP), the Post
Mailbox_provider
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
List of SMTP server return codes
List_of_SMTP_server_return_codes
Extension of Internet protocol
Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication
SMTP_Authentication
Administrator of an email server
common target for spam. RFC 5321, which defines the Simple Mail Transfer Protocol, specifies that all mail servers featuring the ability to relay or deliver
Postmaster_(computing)
This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail. All such figures
List_of_mail_server_software
Networking protocol for real-time communication
between different service providers, in the way that standard Simple Mail Transfer Protocol email currently does for store-and-forward email service, by
Matrix_(protocol)
Mail transfer agent for Unix
Quick Mail Transport Protocol (QMTP), an e-mail transmission protocol that is designed to have better performance than Simple Mail Transfer Protocol (SMTP)
Qmail
Type of resource record in the Domain Name System (DNS)
Simple Mail Transfer Protocol RFC 7505 (2015), A "Null MX" No Service Resource Record for Domains That Accept No Mail Obsoletes: RFC 974 (1986), Mail
MX_record
Computer bug exploit caused by invalid data
Extensible Markup Language (XML) parsers, operating system commands, Simple Mail Transfer Protocol (SMTP) headers, and other program arguments. Injection flaws
Code_injection
Mail server type
SMTP proxies are specialized mail servers that, similar to other types of proxy servers, pass simple mail transfer protocol (SMTP) sessions through to other
SMTP_proxy
Email authentication method designed to associate a domain with a message stream
independent of Simple Mail Transfer Protocol (SMTP) routing aspects, in that it operates on the RFC 5322 message—the transported mail's header and body—not
DomainKeys_Identified_Mail
game. 300-page iPhone bill – A 300-page iPhone bill from AT&T Mobility mailed in a box was the subject of a viral video made by YouTube personality Justine
List_of_viral_videos
Open-source mail transfer agent
facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over
Sendmail
Application layer protocol for e-mail retrieval and storage
Internet Message Access Protocol (IMAP) is an Internet standard protocol used by email clients to retrieve email messages from a mail server over a TCP/IP
Internet Message Access Protocol
Internet_Message_Access_Protocol
Topics referred to by the same term
television series helicopter (military clipping: helo) HELO, a Simple Mail Transfer Protocol command Helo, an Indian-language news app from ByteDance Huddersfield
HELO
Communication protocol property
unreliable protocols.[citation needed] Simple Mail Transfer Protocol (SMTP) is an example of a connection-oriented protocol in which, if a message is not delivered
Connection-oriented communication
Connection-oriented_communication
Simple email-validation system designed to detect email spoofing
4408 and, as of May 2026, RFC 7208 had not been obsoleted. The Simple Mail Transfer Protocol permits any computer to send email claiming to be from any source
Sender_Policy_Framework
Computer program used to access and manage a user's email
(MSA) Mailto Message delivery agent (MDA) Message transfer agent (MTA) Simple Mail Transfer Protocol Text-based email client C. Hutzler; D. Crocker; P
Email_client
Notification of email message status
that may optionally be provided by Message Transfer Agents (MTAs) using the Simple Mail Transfer Protocol (SMTP), or a message format used to return indications
Return_receipt
Email functionality
(October 2008). "Simple Mail Transfer Protocol". Boodhoo, Niala; Carey, Bridget (2009-08-25). "Be careful when you 'reply all' to e-mail". Miami Herald
Blind_carbon_copy
Creating email spam or phishing messages with a forged sender identity or address
ransomware. When a Simple Mail Transfer Protocol (SMTP) email is sent, the initial connection provides two pieces of address information: MAIL FROM: generally
Email_spoofing
400 standards. It plays a similar role to the Simple Mail Transfer Protocol (SMTP) in the TCP/IP protocol suite. Halsall, Fred (1996). Data Communications
Message Oriented Text Interchange Systems
Message_Oriented_Text_Interchange_Systems
Utility program in the Postfix Mail software package
Postfix Mail software package that implements a "black hole" function. It listens on the named host (or address) and port. It accepts Simple Mail Transfer Protocol
Mail-sink
Communications protocol for message-oriented middleware
port 5269. The XMPP network architecture is reminiscent of the Simple Mail Transfer Protocol (SMTP), a client–server model; clients do not talk directly
XMPP
Topics referred to by the same term
audiences CHUNKING, an extension method of the Simple Mail Transfer Protocol for delivering electronic mail in computer networking Pumpkin chunking, the
Chunking
running on the internet protocol suite and using Internet protocols such as FTP, TCP/IP, HTML, and Simple Mail Transfer Protocol (SMTP). Intranets are generally
Intranet_strategies
Communications endpoint in an operating system
email to and from other servers. This is accomplished with the Simple Mail Transfer Protocol (SMTP). A standard SMTP service application listens on TCP port
Port_(computer_networking)
Framework for authentication and data security in Internet protocols
Simple Authentication and Security Layer (SASL) is a framework for authentication and data security in Internet protocols. It decouples authentication
Simple Authentication and Security Layer
Simple_Authentication_and_Security_Layer
Email handling protocol
Comparison of mail servers List of mail server software Post Office Protocol (POP) Push-IMAP Simple Mail Access Protocol Simple Mail Transfer Protocol Webmail
JSON Meta Application Protocol
JSON_Meta_Application_Protocol
American nonprofit organization
name servers; the numbering facilities ICANN manages include the Internet Protocol (IP) address spaces for IPv4 and v6 in addition to the assignment of address
ICANN
Global system of connected computer networks
global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a network
Internet
Peer-to-peer file-sharing protocol
Transport Protocol (μTP, sometimes uTP) is an open User Datagram Protocol-based (UDP-based) variant of the BitTorrent peer-to-peer file-sharing protocol intended
Micro_Transport_Protocol
Cultural item spread via the Internet
generally lasted for a longer time than modern memes. As the Internet protocols evolved, so did memes. Lolcats originated from imageboard website 4chan
Internet_meme
Email authentication method
Sender Policy Framework (SPF) Sender Rewriting Scheme (SRS) Simple Mail Transfer Protocol (SMTP) Variable envelope return path (VERP) "Safari" (2003-12-10)
Bounce_Address_Tag_Validation
System for exchanging messages between computing systems
Examples of protocols that use plain, human-readable text for their commands are FTP (File Transfer Protocol), SMTP (Simple Mail Transfer Protocol), early
Communication_protocol
Framework for communication protocols used in IP networking
application layer protocols include the Hypertext Transfer Protocol (HTTP), the File Transfer Protocol (FTP), the Simple Mail Transfer Protocol (SMTP), and
Internet_protocol_suite
Code that indicates the nature of an error
List of HTTP status codes List of FTP server return codes Simple Mail Transfer Protocol § Protocol overview Error codes in automobiles, sometimes referred
Error_code
Principal protocol used to assign IPv4 addresses on an IPv4 network
called DHCPv6. The Reverse Address Resolution Protocol (RARP) was defined in 1984 for the configuration of simple devices, such as diskless workstations, with
Dynamic Host Configuration Protocol
Dynamic_Host_Configuration_Protocol
Discussion or informational site published on the internet
programming. Previously, knowledge of such technologies as HTML and File Transfer Protocol had been required to publish content on the Web, and early Web users
Blog
UK set of computer communication protocols
Communications Protocols Unit of the Department of Industry in the late 1970s. It could also run over TCP. The Simple Mail Transfer Protocol was extended
Coloured_Book_protocols
Unique identifier for a digital message
doi:10.17487/RFC5322. RFC 5322. Klensin, J. (October 4, 2008). Simple Mail Transfer Protocol. IETF. doi:10.17487/RFC5321. RFC 5321. Levinson, E. (August
Message-ID
Unauthorized access or manipulation
Email on the internet is sent by the Simple Mail Transfer Protocol (SMTP). While mail can be encrypted between mail servers, this is not typically enforced
Email_hacking
Application layer protocol
HTTP (Hypertext Transfer Protocol) is an application layer protocol in the Internet protocol suite for distributed, collaborative, hypermedia information
HTTP
lmtp_tcp_port. Retrieved 2025-07-30. Postel, Jonathan B. (August 1982). Simple Mail Transfer Protocol. IETF. p. 44. doi:10.17487/RFC0821. STD 10. RFC 821. Retrieved
List of TCP and UDP port numbers
List_of_TCP_and_UDP_port_numbers
Method against email spam
4xx reply codes ("please call back later") as defined in the Simple Mail Transfer Protocol (SMTP). Fully capable SMTP implementations are expected to maintain
Greylisting_(email)
Dissemination of large numbers of SMS messages
SMTP (Simple Mail Transfer Protocol for Email) REST (Representational State Transfer Protocol) FTP (File Transfer Protocol) HTTP (Hypertext Transfer Protocol)
Bulk_messaging
Network that allows computers to share resources and communicate with each other
2012-04-15. Retrieved 2011-10-25. Klensin, J. (October 2008). Simple Mail Transfer Protocol. IETF. doi:10.17487/RFC5321. RFC 5321. Mockapetris, P. (November
Computer_network
allows the user to send anonymous personalized messages on potatoes via the mail. Pepsi MAX & Jeff Gordon Present: Test Drive – A short film where NASCAR
List_of_Internet_phenomena
Cryptographic protocols for securing data in transit
parameters, options, side effects, and return values." The Simple Mail Transfer Protocol (SMTP) can also be protected by TLS. These applications use
Transport_Layer_Security
Overview of and topical guide to the Internet
Real-time Transport Protocol (RTP) – Session Initiation Protocol (SIP) – Simple Mail Transfer Protocol (SMTP) – Simple Network Management Protocol (SNMP) – SOCKS
Outline_of_the_Internet
Group of network or telecommunication providers agreeing upon interoperability standards
Internet Protocol (IP) stack of protocols. Another, more visible, example is Email, where the common use of the Simple Mail Transfer Protocol (SMTP), allows
Federation (information technology)
Federation_(information_technology)
Personal information manager for the GNOME desktop environment
Post Office Protocol (POP) and Internet Message Access Protocol (IMAP) protocols and email transmission with Simple Mail Transfer Protocol (SMTP) Secure
GNOME_Evolution
Open internet standards organization
for the Internet responsible for the technical standards of the Internet protocol suite (TCP/IP). It has no formal membership roster or requirements and
Internet Engineering Task Force
Internet_Engineering_Task_Force
Organization dedicated to creating email with end-to-end encryption
encryption, Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP), Internet Message Access Protocol (IMAP) and Hypertext Transfer Protocol (HTTP)
Dark_Mail_Alliance
Multimedia Messaging Service standards
Centers SMSC. This interface typically uses TCP/IP based protocols for e.g. Simple Mail Transfer Protocol ( SMTP ) Generally, it is the responsibility of MMSC
MMS_Architecture
Command-line SMTP testing tool
SMTP) is a command-line tool designed for testing and debugging Simple Mail Transfer Protocol (SMTP) servers. It is written in Perl and supports a wide range
Swaks
purpose. For instance, although both FTP (File Transfer Protocol) and SMTP (Simple Mail Transfer Protocol) facilitate computer-to-computer communication
Software_standard
Protocol for real-time Internet chat and messaging
non-multicasting protocols such as Simple Mail Transfer Protocol (SMTP)[citation needed] or Extensible Messaging and Presence Protocol (XMPP)[citation
IRC
Destination to which emails are delivered
lists exist, for example on GitHub. ISO/IEC 2382:2015 RFC 5321, Simple Mail Transfer Protocol, J. Klensin, The Internet Society (October 2008), Section 2
Email_box
SMTP—Simple Mail Transfer Protocol SMTPS—Simple Mail Transfer Protocol Secure SNA—Systems Network Architecture SNMP—Simple Network Management Protocol SNP—Secure
List of computing and IT abbreviations
List_of_computing_and_IT_abbreviations
efficiency, configurability and extendibility. It supports the Simple Mail Transfer Protocol (SMTP) as specified by RFC 2821 and various extensions. The
MeTA1
Form of electronic commerce
a catalog mailing list. This information is obviously not accessible to the merchant when paying in cash or through a bank (money transfer, in which case
Online_shopping
Email system
the sender to the final mail delivery agent (and possibly via intermediate mail servers) using Simple Mail Transfer Protocol. If the receiver uses a polling
Push_email
American computer scientist and Internet pioneer (1943–1998)
editor of the Request for Comment (RFC) document series, for Simple Mail Transfer Protocol (SMTP), and for administering the Internet Assigned Numbers
Jon_Postel
Organization responsible for managing network numbering
website, its purpose is "to review and develop recommendations on Internet Protocol (IP) address policy and to advise the ICANN Board on policy issues relating
Regional_Internet_registry
Programming language
document: John Klensin (October 2008). "Trace Information". Simple Mail Transfer Protocol. IETF. sec. 4.4. doi:10.17487/RFC5321. RFC 5321. final delivery
Sieve (mail filtering language)
Sieve_(mail_filtering_language)
Canadian technology company
IETF. April 2014. sec. 2.4. doi:10.17487/RFC7208. RFC 7208. Simple Mail Transfer Protocol. IETF. October 2008. sec. 7. doi:10.17487/RFC5321. RFC 5321
MailChannels
Email marketing company
product was rebranded as BenchmarkONE. Social media marketing Simple Mail Transfer Protocol "An SEO-Driven Bootstrapping Success: Benchmark Email CEO Curt
Benchmark_Email
HTTP extension supporting TLS encryption
Hypertext Transfer Protocol Secure (HTTPS) is an extension of the Hypertext Transfer Protocol (HTTP). It uses encryption for secure communication over
HTTPS
gateway services went beyond simple mail peering, such as allowing access to File Transfer Protocol (FTP) sites via UUCP or mail. Finally, routing technologies
History_of_the_Internet
Principle that Internet service providers should treat all data equally
depending on which transfer method is used. To proponents of net neutrality, this suggests that prioritizing any one transfer protocol over another is generally
Net_neutrality
Campaign for plain text (only) emails
attitudes towards vCard. Simple Mail Transfer Protocol MIME Sperling, Patric (2002-12-23) [2000], ASCII Ribbon Campaign — against HTML mail, vCards and proprietary
ASCII_ribbon_campaign
Mail service
document: John Klensin (October 2008). "Trace Information". Simple Mail Transfer Protocol. IETF. sec. 4.4. doi:10.17487/RFC5321. RFC 5321. final delivery
Maildrop
Type of resource record in the Domain Name System (DNS)
example.com. 3600 IN A 192.0.2.1 Domains that are used in the Simple Mail Transfer Protocol MAIL and RCPT commands may not have a CNAME record. In practice
CNAME_record
Malicious Spamming technique
e-mail sent to invalid recipient e-mail addresses during the Simple Mail Transfer Protocol (SMTP) session. Any addresses to which email is accepted are
Directory_harvest_attack
Early packet switching network (1969–1990)
electronic mail, were developed and eventually ported to run over the TCP/IP protocol suite. In the 1980s, FTP for email was replaced by the Simple Mail Transfer
ARPANET
Very basic transfer protocol over UDP
The Trivial File Transfer Protocol (TFTP) is a simple communication protocol for transmitting or receiving files in a client-server application. A primary
Trivial File Transfer Protocol
Trivial_File_Transfer_Protocol
RFC 4422 Simple Mail Transfer Protocol, Internet Message Format RFC 196, RFC 772, RFC 821, RFC 822, RFC 2821, RFC 2822, RFC 5321, RFC 5322 Simple Network
List_of_RFCs
Individual connection to the Internet
Internet protocols and only provided terminal-to-host connections. The introduction of network access servers supporting the Serial Line Internet Protocol (SLIP)
Internet_access
Text file describing a DNS zone
address in the record data; a mail exchanger record (type MX) specifies the Simple Mail Transfer Protocol (SMTP) mail host for a domain. The record data
Zone_file
Network protocol used by the Web
2015). "Protocol Action: 'Hypertext Transfer Protocol version 2' to Proposed Standard (draft-ietf-httpbis-http2-17.txt)". httpbis (Mailing list). Retrieved
HTTP/2
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