Depending on how you employ this rule set,
you might wish to return more complex information, such as the original workspace
augmented with good or bad.
Prior to V8.14, if the address was a header address, neither the s nor the r would be
present. Beginning with V8.14, when this ${addr_type} shows a header, the difference
between a sender and recipient header will be shown by the presence of an s or an r.
${addr_type} is transient. If it is defined in the configuration file or command line, that
definition can be ignored by sendmail. Note that it is currently not possible to differentiate
between a header sender and a header recipient with this macro.
Also note that a $& prefix is necessary when you reference this macro in rules (that is, use
$&{addr_type}, not ${addr_type}).
21.9.4 ${alg_bits}
The number of bits in the TLS cipher V8.11 and later
TLS is a protocol implemented with the OpenSSL library. When the remote site recognizes
that the local sendmail supports the STARTTLS ESMTP extension, and if policy at the
remote site allows it to, the remote site sends the STARTTLS command. If that command
is accepted by the local sendmail, the two sides negotiate a secure connection. Part of the
information determined in this negotiation is the cipher to use. Once a cipher has been
accepted, and the connection allowed, sendmail updates the value of several macros,
among which is this ${alg_bits} macro.
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