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PHPMailer is a code library to send (transport) emails safely [8] and easily via PHP code from a web server ( MUA to the MSA server). Sending emails directly by PHP code requires a high-level familiarity to SMTP protocol standards ( RFC 821, 2821, 5321) and related issues (such as Carriage return) and vulnerabilities about email injection for ...
The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing ...
The Internet Message Access Protocol is an application layer Internet protocol that allows an e-mail client to access email on a remote mail server. The current version is defined by RFC 9051. An IMAP server typically listens on well-known port 143, while IMAP over SSL/TLS (IMAPS) uses 993. [2] [3]
SMTP Authentication. 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 mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory. [1]
X.1.XXX Addressing Status. X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 . A ...
Email spoofing is the creation of email messages with a forged sender address; something that is simple to do because many mail servers do not perform authentication. Spam and phishing emails typically use such spoofing to mislead the recipient about the origin of the message. ^ Bursztein, Elie; Eranti, Vijay (2013-12-06).
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.
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. A stock Unix-like server already has internal mail ...