OK. Digging into this...
sendmail.m4 has the lines:
define(`FAX_MAILER_PATH',`/usr/bin/faxmail')dnl
define(`FAX_MAILER_ARGS',`faxmail -d -n -p 12pt $u@$h $f')dnl
MAILER(`fax')dnl
proto.m4 has:
`R$+ < @ $+ .FAX. > $#fax $@ $2 $: $1 user at host.FAX',
`ifdef(`FAX_RELAY',
`R$*<@$+.FAX.>$* $: $>MailerToTriple < $F > $1 <@$2.FAX.>
$3 user at host.FAX',
sendmail.cf has:
R$+ < @ $+ .FAX. > $#fax $@ $2 $: $1 user at host.FAX
If the To: header is: joe at 222.fax.foo.com
creates a -d argument of: >joe<@2201.fax.foo.com.
changing the proto.m4 to:
`R$+ < @ $+ .FAX. > $#fax $@ $2 $: $1 user at host',
`ifdef(`FAX_RELAY',
`R$*<@$+.FAX.>$* $: $>MailerToTriple < $F > $1 <@$2>
$3 user at host',
makes no difference....
So either I need a LOT of help understanding the expressions in proto.m4
or
proto.m4 is NOT the source of the content of sendmail.cf and I need to
find the REAL source....