smtp man page on Plan9

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SMTP(8)								       SMTP(8)

       smtp, smtpd -  mail transport

       upas/smtp [ -aAdfiops ] [ -b busted-mx ] ... [ -g gateway ] [ -h host ]
	    [ -u user ] [ .domain ] destaddr sender rcpt-list

       upas/smtpd [ -adDfrg ] [ -c certfile ] [ -h mydom ] [ -k evilipaddr ] [
	    -m mailer ] [ -n netdir ]

       Smtp  sends the mail message from standard input to the users rcpt-list
       on the host at network address address using the Simple	Mail  Transfer
       Protocol.  The options are:

       -a     if  the server supports PLAIN or LOGIN authentication, authenti‐
	      cate to the server using a password from factotum(4).  See  RFCs
	      3207 and 2554.  This option implies -s.

       -A     autistic	server:	 don't	wait  for  an SMTP greeting banner but
	      immediately send a command to provoke the server	into  respond‐

       -b     ignore busted-mx when trying MX hosts.  May be repeated.

       -d     turn on debugging to standard error.

       -f     just filter the converted message to standard output rather than
	      sending it.

       -g     makes gateway the system to pass the message to  if  smtp	 can't
	      find an address nor MX entry for the destination system.

       -h     use  host as the local system name; it may be fully-qualified or
	      not.  If not specified, it  will	default	 to  the  contents  of

       -i     under -a, authenticate even if we can't start TLS.

       -o     under -s, use TLS even if we don't know the remote system.

       -p     ping:  just  verify  that	 the  users named in the rcpt-list are
	      valid users at destaddr; don't send any mail.

       -s     if the server supports the ESMTP extension to  use  TLS  encryp‐
	      tion, turn it on for this session.  See RFC3207 for details.

       -u     specify  a  user name to be used in authentication.  The default
	      name is the current login id.

       Finally if .domain is given, it is appended to the end of any  unquali‐
       fied system names in the envelope or header.

       Smtpd  receives	a  message  using  the	Simple Mail Transfer Protocol.
       Standard input and output are the protocol connection.  SMTP  authenti‐
       cation by login and cram-md5 protocols is supported; authenticated con‐
       nections are permitted to relay.

       The options are:

       -a     requires that all clients authenticate to be able to send mail.

       -c     specifies a certificate to use for TLS.	Without	 this  option,
	      the capability to start TLS will not be advertised.

       -d     turns  on	 debugging output, with each connection's output going
	      to a uniquely-named file in /sys/log/smtpdb.

       -D     sleeps for 15 seconds usually at the start of the SMTP dialogue;
	      this  deters  some  spammers.  Connections from Class A networks
	      frequented by spammers will incur a longer delay.

       -f     prevents relaying from non-trusted networks.  It also tags  mes‐
	      sages  from  non-trusted	sites  when  they deliver mail from an
	      address in a domain we believe we represent.

       -g     turns on grey/white list processing.  All mail is rejected (with
	      a	 retry	code)  unless  the  sender's  IP  address  is  on  the
	      whitelist, /mail/grey/whitelist, an append only file.  Addresses
	      can  be  added  to the whitelist by the administrator.  However,
	      the usual way for addresses to be	 added	is  by	smtpd  itself.
	      Whenever a message is received and the sender's address isn't on
	      the whitelist, smtpd first looks for  the	 file  /mail/grey/tmp‐
	      /local/remote/recipient, where local and remote are IP addresses
	      of the local and remote systems, respectively.  If it exists and
	      was  created  more  than a few minutes go, the remote address is
	      added to the whitelist.  If not, the file	 is  created  and  the
	      mail  is	rejected  with a `try again' code.  The expectation is
	      that spammers will not retry for more than  a  few  minutes  and
	      that others will.

       -h     specifies	 the receiving domain.	If this flag is not specified,
	      the receiving domain is inferred from the host name.

       -k     causes connections from the host at the IP address,  evilipaddr,
	      to  be  dropped  at  program startup.  Multiple addresses can be
	      specified with several -k options.  This option should  be  used
	      carefully;  it  is  intended  to lessen the effects of denial of
	      service attacks or broken	 mailers  which	 continually  connect.
	      The  connections	are  not  logged  and the remote system is not
	      notified via the protocol.

       -m     set the mailer to which smtpd passes a  received	message.   The
	      default is /bin/upas/send.

       -n     specifies	 the  name  of	the  network directory assigned to the
	      incoming connection.  This is used  to  determine	 the  peer  IP
	      address.	 If  this  flag	 is not specified, the peer address is
	      determined using standard input.

       -p     permits clients to authenticate using protocols  which  transfer
	      the  password  in	 the  clear, e.g.  login protocol. This should
	      only be used if the connection has  previously  encrypted	 using
	      e.g.  tlssrv(8).

       -r     turns on forward DNS validation of non-trusted sender address.

       -s     causes copies of blocked messages to be saved in a sub-directory
	      of /mail/queue.dump.

       Smtpd is normally run by a network listener such as listen(8).  Most of
       the  command  line options are more conveniently specified in the smtpd
       configuration file stored in /mail/lib/smtpd.conf.


       aliasmail(8), faces(1), filter(1), mail(1), marshal(1), mlmgr(1),  ned‐
       mail(1), qer(8), rewrite(6), send(8), tlssrv(8), upasfs(4)

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