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 of the communication partners, as well as data integrity and confidentiality.
SMTPS is neither a proprietary protocol nor an extension of SMTP. It is a way to secure SMTP at the transport layer, by wrapping SMTP inside Transport Layer Security (TLS). Conceptually, it is similar to how HTTPS wraps HTTP inside TLS.
This means that the client and server speak normal SMTP at the application layer, but the connection is secured by SSL or TLS. This happens when the TCP connection is established, before any mail data has been exchanged. Since whether or not to use SSL or TLS is not explicitly negotiated by the peers, services that speak SMTPS are usually reachable on a dedicated port of their own.
negotiated by the peers, services that speak SMTPS are usually reachable on a dedicated port of their own. "smtps" is also the name of an IANA-registered service...
Protocol (SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send...
SMTP 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 proxies are specialized mail servers that, similar to other types of proxy servers, pass simple mail transfer protocol (SMTP) sessions through to...
POP before SMTP or SMTP after POP is a method of authentication used by mail server software which helps allow users the option to send e-mail from any...
Simple Mail Transfer Protocol (SMTP), to send the message content to the local mail submission agent (MSA), in this case smtp.a.org. The MSA determines the...
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...
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...
library, Standard Template Library Data Protocol TCP/IP, Kermit, FTP, HTTP, SMTP File format HTML, XML, JPEG, MPEG, PNG User interface Graphical user interface...
monitoring. The STARTTLS command for IMAP and POP3 is defined in RFC 2595, for SMTP in RFC 3207, for XMPP in RFC 6120 and for NNTP in RFC 4642. For IRC, the...
domain; if the domain is a domain name rather than an IP address then the SMTP client uses the domain name to look up the mail exchange IP address. The...
typically either an MSA or an MTA, two variations of the SMTP protocol. The email client which uses the SMTP protocol creates an authentication extension, which...
protocol such as HTTP (port 80) with that for a non-proxied protocol such as SMTP (port 25). By attempting to make a connection to an IP address at which there...
domain and their preferences. The sending agent then attempts to establish an SMTP connection, trying the host with the lowest "Priority" value first. The system...
The integration with SMTP email is specified in RFC 1521 and RFC 1522. Although the MIME formalism was designed mainly for SMTP, its content types are...
the Home screen. Access to web email servers, supporting POP3, IMAP4, and SMTP. Gmail synchronization with the Gmail application. Google Contacts synchronization...
callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses. The most common target of...
Notification" (DSN) message, or a "Non-Delivery Notification" (NDN). Although the SMTP is a mature technology, counting more than thirty years, its architecture...
files. Base64 is also widely used for sending e-mail attachments, because SMTP – in its original form – was designed to transport 7-bit ASCII characters...
message. The original base of Internet email, Simple Mail Transfer Protocol (SMTP), has no such feature, so forged sender addresses in emails (a practice known...
through a socket to the web server software and port 25 to a mail server's SMTP daemon. The IP address of a public server is also important, similar in global...
refer to the email address provided with the MAIL FROM command during the SMTP session. Ordinarily, the bounce address is not seen by email users and, without...
Global Information