.cindex "environment"
If &%environment%& is given as an argument, the set of environment
-variables is output, line by line. Using the &%-n%& flag supresses the value of the
+variables is output, line by line. Using the &%-n%& flag suppresses the value of the
variables.
.cindex "options" "macro &-- extracting"
Curve names of the form &'prime256v1'& are accepted.
For even more-recent library versions, names of the form &'P-512'&
are also accepted, plus the special value &'auto'&
-which tell the library to choose.
+which tells the library to choose.
If the option is set to an empty string, no EC curves will be enabled.
An attempt to set this option for any recipient but the first
for a mail will be quietly ignored.
-If a recipient-verify callout connection is subsequently
+If a recipient-verify callout
+.new
+(with use_sender)
+.wen
+connection is subsequently
requested in the same ACL it is held open and used for
any subsequent recipients and the data,
otherwise one is made after the initial RCPT ACL completes.