qmail-smtpd(8) - receive mail via SMTP

SYNOPSIS

       qmail-smtpd

DESCRIPTION

       qmail-smtpd  receives  mail  messages  via the Simple Mail
       Transfer  Protocol  (SMTP)  and  invokes  qmail-queue   to
       deposit them into the outgoing queue.  qmail-smtpd must be
       supplied  several  environment  variables;  see  tcp-envi­
       ron(5).

       qmail-smtpd  is responsible for counting hops.  It rejects
       any message with 100  or  more  Received  or  Delivered-To
       header fields.

       qmail-smtpd  supports  ESMTP,  including  the 8BITMIME and
       PIPELINING options.

TRANSPARENCY

       qmail-smtpd converts the SMTP newline convention into  the
       UNIX  newline  convention by converting CR LF into LF.  It
       returns a temporary error and drops the connection on bare
       LFs; see http://pobox.com/~djb/docs/smtplf.html.

       qmail-smtpd  accepts  messages  that contain long lines or
       non-ASCII characters, even though  such  messages  violate
       the SMTP protocol.

CONTROL FILES

       badmailfrom
            Unacceptable  envelope sender addresses.  qmail-smtpd
            will reject every recipient address for a message  if
            the envelope sender address is listed in badmailfrom.
            A line in badmailfrom may be of the form @host, mean­
            ing every address at host.

       databytes
            Maximum  number  of  bytes allowed in a message, or 0
            for no limit.  Default: 0.  If a message exceeds this
            limit,  qmail-smtpd returns a permanent error code to
            the client; in contrast,  if  the  disk  is  full  or
            qmail-smtpd   hits   a  resource  limit,  qmail-smtpd
            returns a temporary error code.

            databytes counts bytes as  stored  on  disk,  not  as
            transmitted  through  the network.  It does not count
            the  qmail-smtpd  Received  line,   the   qmail-queue
            Received line, or the envelope.

            If  the  environment  variable  DATABYTES  is set, it
            overrides databytes.

       localiphost
            changes.

            Rule  of thumb for large sites: Put your 50 most com­
            monly used domains into rcpthosts, and the rest  into
            morercpthosts.

       rcpthosts
            Allowed  RCPT  domains.   If  rcpthosts  is supplied,
            qmail-smtpd  will  reject  any   envelope   recipient
            address with a domain not listed in rcpthosts.

            Exception: If the environment variable RELAYCLIENT is
            set, qmail-smtpd  will  ignore  rcpthosts,  and  will
            append  the  value  of  RELAYCLIENT  to each incoming
            recipient address.

            rcpthosts may include wildcards:

               heaven.af.mil
               .heaven.af.mil

            Envelope recipient  addresses  without  @  signs  are
            always allowed through.

       smtpgreeting
            SMTP  greeting message.  Default: me, if that is sup­
            plied; otherwise qmail-smtpd will refuse to run.  The
            first  word  of  smtpgreeting  should  be the current
            host's name.

       timeoutsmtpd
            Number of seconds qmail-smtpd will wait for each  new
            buffer of data from the remote SMTP client.  Default:
            1200.

       spamt
            The  spam  throttle  parameters  file.   See
	    qmail-newst(8) and qmail-spamt(5) for details.

SEE ALSO

       tcp-env(1),   tcp-environ(5),   qmail-control(5),   
       qmail-spamt(5), qmail-spamthrottle(5),  qmail-inject(8),  
       qmail-newmrh(8), qmail-newst(8), qmail-queue(8), qmail-remote(8)

                                                   qmail-smtpd(8)