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:

 Z   envelopeID   

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.



Sendmail
sendmail, 4th Edition
ISBN: 0596510292
EAN: 2147483647
Year: 2002
Pages: 1174

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