Issue

• We would like to relay a mail with null sender (MAIL FROM: <>).
• We tried to achieve it by using "FEATURE(relay_mail_from',domain')" and /etc/mail/access, but we couldn't.
• diff of sendmail.mc

    @@ -99,7 +99,8 @@
     dnl #
     FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl
     FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
    -FEATURE(`blacklist_recipients')dnl
    +FEATURE(`relay_mail_from', `domain')dnl
    +dnl FEATURE(`blacklist_recipients')dnl
     EXPOSED_USER(`root')dnl
     dnl #
     dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery uncomment
    @@ -113,7 +114,7 @@
     dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
     dnl # address restriction to accept email from the internet or intranet.
     dnl #
    -DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
    +dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
     dnl #
     dnl # The following causes sendmail to additionally listen to port 587 for
     dnl # mail from MUAs that authenticate. Roaming users who can't reach their

• diff of /etc/mail/access

    @@ -7,6 +7,8 @@
     # cyrus-sasl-plain package installed.
     #
     # By default we allow relaying from localhost...
    -Connect:localhost.localdomain          RELAY
    -Connect:localhost                      RELAY
    -Connect:127.0.0.1                      RELAY
    +#Connect:localhost.localdomain         RELAY
    +#Connect:localhost                     RELAY
    +#Connect:127.0.0.1                     RELAY
    +From:<>                                RELAY
    +From:test@example.com                   RELAY

• But, null sender is not relayed.

       # telnet 192.168.122.1 25
       Trying 192.168.122.1...
       Connected to testmta (192.168.122.1).
       Escape character is '^]'.
       220 testmta ESMTP Sendmail 8.14.4/8.14.4; Tue, 22 Oct 2013 13:19:48 +0900
       HELO localhost
       250 testmta Hello testclient [192.168.122.2], pleased to meet you
       MAIL FROM:<>
       250 2.1.0 <>... Sender ok
       RCPT TO:test@example.com
       550 5.7.1 test@example.com... Relaying denied          <==== failure