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Updated:July 17, 2014
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Why does the ESA accept and deliver mail messages containing bare <LF> characters?
SMTP commands and message data are transmitted in "lines". Lines consist of zero or more data characters terminated by a <CR> character followed immediately by a <LF> character. This sequence is denoted using the string <CRLF>. RFC2821 requires SMTP clients and servers to not accept any other character (such as a "bare" <LF>) or to generate any other sequence as a line terminator.
The MTA component of the ESA accepts and delivers messages that include bare <LF> characters as line delimiters, in the interest of better interoperability and in response to overwhelming customer requests. ESA users have the choice to pass bare <LF> or <CR> line delimiters through or to "clean" these delimiters, replacing the single characters with the complete <CRLF>.