12.24 on page 1159) 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 (?§21.9.43 on
page 823) also stores the ENVID value.
11.12.22 ! line
Deliver-by specification V8.12 and later
Beginning withV8.12, sendmail supports the DELIVERBY SMTP extension (defined by
RFC2825). If the DeliverByMin option (?§24.9.34 on page 1003) was defined witha positive
value, a BY= equate can follow the SMTP MAIL From: command for inbound email. The BY=
equate defines the window of time during which the message should be delivered. That
equate??™s time value can optionally be followed by a flag that states what to do upon
delivery (an r flag), or upon delivery failure (an n flag). There can also be a flag that advises
sendmail to trace delivery (a v flag). The BY= information is saved in the qf file on an ! line:
!flag time
Here, the time is the time specified by the By= and the flag is a 1-byte integer that encodes a
value of 1 (notify the sender upon delivery), or 2 (return the message if it cannot be delivered
in time). Additionally, the flag can be OR??™d with a 0x10 (trace the delivery).
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