${envid}
The original DSN envelope ID V8.8 and later
RFC1891 specifies that the keyword ENVID can be given
to the MAIL From:
command:
MAIL From:<address> ENVID=envelopeID
ENVID is used to propagate a consistent envelope
identifier (distinct from the Message-ID: header; see
Message-ID: on page 1159)
that will be permanently associated with the
message. The envelopeID
can contain any ASCII characters between ! and ~, except + and =. Any characters
outside that range must be encoded by prefixing an
uppercase, two-digit, hexadecimal representation of
it with a plus sign. For example, an
envelopeID composed of
the letter X
followed by a delete character would be encoded like
this:
X+7F
When mail is received over an SMTP channel and an
ENVID identifier is specified, that identifier is
saved as part of the envelope information. The value
of the ENVID identifier is saved in and restored
from the qf
file’s Z line
(Z line on page 458). For
bounced mail, the ENVID identifier is printed with
the Original-Envelope-Id: DSN header (see
RFC1894) as part of the DSN MIME body. Beginning
with V8.8 sendmail, an ENVID
identifier can also be assigned to a message with
the -V
command-line switch (-V on page
249).
The ${envid} macro
is set only during delivery. By contrast, the
${dsn_envid}
macro (${dsn_envid} on page 820) is set when mail is received via
SMTP and when the -V command-line switch (-V on page 249) is used to set the
envelope identifier.
When mail is delivered, the value of the envelope’s ENVID ...
Get sendmail, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
