@item message-generate-hashcash
@vindex message-generate-hashcash
\e$B%a%C%;!<%8$N$?$a$N\e(B @samp{X-Hashcash} \e$B%X%C%@!<$r7W;;$7$FIU2C$9$Y$-$+$I$&\e(B
-\e$B$+$r;X<($9$k%V!<%kJQ?t\e(B (@code{nil} \e$B$+Hs\e(B-@code{nil}) \e$B$G$9!#\e(B
-@xref{Hashcash, ,Hashcash, gnus-ja, The Gnus Manual}.
+\e$B$+$r;X<($9$kJQ?t$G$9!#\e(B@xref{Hashcash, ,Hashcash, gnus-ja, The Gnus
+Manual}. @symbol{opportunistic} \e$B$K$9$k$H!"%f!<%6!<$rBT$?$;$J$$>l9g$K8B\e(B
+\e$B$j!"%X%C%@!<$r:n$j$^$9!#\e(B
@end table
@node Mail Variables