Tweak.
 [rsc] --rw-rw-r-- M 615310 presotto sys 4509 Dec  2 11:49 sys/man/8/smtp
	/n/sourcesdump/2005/1202/plan9/sys/man/8/smtp:52,71 - 
	/n/sourcesdump/2005/1203/plan9/sys/man/8/smtp:52,67
	  .B -d
	  turn on debugging to standard error.
	  .TP
	- .B -a
	- authenticate ourself to the server if the server
	- supports PLAIN authentication and allows us to first
	- start up an encrypted TLS connection
	- .TP
	  .B -s
	  if the server supports the ESMTP extension to use TLS encryption, turn it on for
	  this session.  See RFC3207 for details.
	  .TP
	- .B -a
	- if the server supports the ESMTP extension to use TLS encryption, turn it
	- on.  If the server also supports the PLAIN (user + password) authentication,
	+ if the server also supports PLAIN or LOGIN authentication,
	  authenticate to the server using a password from
	- .IR factotum (4).  See RFC's 3207 and 2554.
	+ .IR factotum (4).
	+ See RFCs 3207 and 2554.
	+ This option also implies
	+ .B -s .
	  .TP
	  .B -u
	  specify a user name to be used in authentication.  The default name is
	/n/sourcesdump/2005/1202/plan9/sys/man/8/smtp:92,98 - 
	/n/sourcesdump/2005/1203/plan9/sys/man/8/smtp:88,94
	  .PP
	  Finally if
	  .I .domain
	- is given, it is appended to the end of any unqaulified system names
	+ is given, it is appended to the end of any unqualified system names
	  in the envelope or header.
	  .PP
	  .I Smtpd
	/n/sourcesdump/2005/1202/plan9/sys/man/8/smtp:118,126 - 
	/n/sourcesdump/2005/1203/plan9/sys/man/8/smtp:114,124
	  .BR /mail/lib/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,
	- .B smtpd
	+ the usual way for addresses to be added is by
	+ .I smtpd
	+ itself.
	+ Whenever a message is received and the sender's address isn't on the whitelist,
	+ .I smtpd
	  first looks for the file,
	  .B /mail/grey/<remote ipaddr>/<local ipaddr>/<recipient> .
	  If that file exists, the remote address is added to the whitelist.  If