''Z line'' '''

Z line

DSN ENVID envelope identifierV8.7 and above

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:


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.

    Part I: Build and Install
    Part II: Administration
    Part III: The Configuration File