10 and later
All envelope addresses (sender and recipient) are passed through the parse rule set 0 so that
a delivery agent can be selected. Upon receipt of the RCPT To: address, a delivery agent is
selected by the RHS of the parse rule set 0, which defines a triple that contains three pieces
of information for that address:
$#delivery_agent $@ host $:address
The $@ portion of the triple contains the host to which to connect for delivery. For
example:
your.domain
Once that host is determined for the $@ part of the delivery agent triple, it is copied to this
${rcpt_host} macro. For some local delivery agents, this ${rcpt_host} macro can be
undefined (NULL).
${rcpt_host} is transient. If it is defined in the configuration file or in the command line,
that definition can be ignored by sendmail. Note that a $& prefix is necessary when you
reference this macro in rules (that is, use $&{rcpt_host}, not ${rcpt_host}).
21.9.85 ${rcpt_mailer}
Saved $# value for RCPT To: triple V8.10 and later
All envelope addresses (sender and recipient) are passed through the parse rule set 0 so that
a delivery agent can be selected. Upon receipt of the RCPT To: address, a delivery agent is
selected by the RHS of the parse rule set 0, which defines a triple that contains three pieces
of information for that address:
$#delivery_agent $@ host $:address
The $# portion of the triple specifies the delivery agent to use for delivery.
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