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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 ...
Code injection is a computer security ... parsers, operating system commands, Simple Mail Transfer Protocol headers, ... in PHP, using the htmlspecialchars() function ...
The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined ...
Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the "Warning" HTTP header. [56] [57] Since this "Warning" header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with RFC 9111. [58]
Multipurpose Internet Mail Extensions (MIME) is a standard that extends the format of email messages to support text in character sets other than ASCII, as well as attachments of audio, video, images, and application programs. Message bodies may consist of multiple parts, and header information may be specified in non-ASCII character sets.
An email’s full headers include info about how it was routed and delivered and the true sender of the email. View the full headers to find out where an email was delayed or if the real sender disguised their email address. View the full header of an email. 1. Click an email to open it. 2. Click the More drop-down in the top menu. 3.
Email injection is a security vulnerability that can occur in Internet applications that are used to send email messages. It is the email equivalent of HTTP Header Injection . Like SQL injection attacks, this vulnerability is one of a general class of vulnerabilities that occur when one programming language is embedded within another.
Clicking on the hyperlink automatically opens the default email client, with the destination email address pre-filled. It is possible to specify initial values for headers (e.g. subject, cc, etc.) and message body in the URL. Blanks, carriage returns, and linefeeds cannot be directly embedded but must be percent-encoded: [4]