Name
Z line
Synopsis
The MAIL ESMTP command can optionally be followed by an RFC1891 ENVID envelope identifier:
MAIL From: <address
> ENVID=envelopeID
ENVID is used to propagate a consistent envelope identifier (distinct
from the Message-ID
: header, Message-ID:) that is permanently associated with a
message.
The Z
line holds that ENVID envelope identifier
information:
ZenvelopeID
The ENVID information needs to be held separately from the
S
sender line because
sendmail has no way to determine in advance
whether a recipient host speaks ESMTP.
There must be only a single Z
line in any
qf
file. The ${envid}
sendmail macro (${envid})
also stores the ENVID value.
Get Sendmail, 3rd 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.