a49093915 via Postfix-users:
> Hello,
>
> Unfortunately I was unable to find this information myself, so I am now
> asking here:
>
> Does postfix forward the end of data characters from the client or does it
> replace them?
> Is there any way to influence this behavior?
Line endings depends on context. UNIX files and commands use <LF>,
whereas SMTP and LMTP use <CR><LF>. Instead of picking a specific
line ending, Postfix uses none. Instead it stores a length and text.
When delivering mail, Postfix ADDS the line endings that are appropriate.
- The delivery agents for UNIX files and commands add <LF> line endings.
The pipe daemon can also be configured to prepend "." and append
<CR><LF>.
- The Postfix SMTP and LMTP clients add the SMTP encapsulation:
they append <CR><LF> at the end of a line, and prepend "." to to
lines that start with ".". This behavior is required by the
protocol and is not configurable.
For completeness, when receiving mail, Postfix strips line endings.
- The Postfix SMTP server REMOVES the SMTP encapsulation: the
<CR><LF> line endings and "." at the start of a line.
(for compatiility with poorly written apps, it may also permit
bare <LF<> depending on "smtpd_forbid_bare_newline" configuration).
- The Postfix sendmail command REMOVES the UNIX-style <LF> line
ending.
(for compatibility with poorly written apps, it may also remove
<CRL><LF> depending on "sendmail_fix_line_endings" cxonfiguration)
Additionally, the latest Postfix 3.5..2.9 versions will replace
<LF> or <CR> in the middle of a line with the SPACE character.
This neutraslizes any attempts to inject false line endings.
Wietse
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