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Postfix













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Commands/Troubleshooting




config files in /etc/postfix
	main.cf
logs in /var/log/maillog

postfix reload		# after doing changes to config files
postfix flush 		# churn thru the mail backlog ==? postqueue -f
mailq			# check the mailq  == postqueue -p
postsuper -d 6DF3D6A444 # remove a specific mail in the queue with the specified id
postsuper -d deferred   # remove all deferred mail (but not other errors).   CAREFUL!
postsuper -d ALL        # remove all queue mail (all those shown by mailq).  VERY CAREFUL!


postconf -d    # show default param for postfix 
postconf -d  | grep mydomain
postconf -d  | grep myhost 

postconf -n             # to find out what settings are overruled by your main.cf. , 
                        # show what postfix parsed/took out of config file
postconf mail_version   # To find out what Postfix version you have, execute the command 




    




address rewritting bible :)

http://www.postfix.org/ADDRESS_REWRITING_README.html#masquerade

mascarade is to hide some early portion of the domain name, 
eg strip na.nova.com to nova.com


/etc/postfix/canonical
	# change domain address in both sender and recipient
	# main for username to first.last, 
	# but should be able to specify domain as in eg of sender-canonical
	# postmap ./canonical
	# postmap -q "string" ./canonical # ??
	# eg:
	@local          @lbl.gov
	@beagle         @lbl.gov
	@beagle.local   @lbl.gov




/etc/postfix/sender-canonical		# sender only, need to enable clause in main.cf.  
	# eg content:
	@local          @lbl.gov
	@beagle         @lbl.gov
	@beagle.local   @lbl.gov
	# eg content 2:
	@local		@na.grumpy.com
	@headnode	@na.grumpy.com
	@headnode.local	@na.grumpy.com


/etc/postfix/recipient-canonical	# eg:
	root@na.grumpy.com	root
	@mycluster.local	@na.grumpy.com
	eg2: 
	root@beagle.lbl.gov    root
	@gretadev              @lbl.gov
	@beagle                @lbl.gov
	@beagle.local          @lbl.gov



after update to the file, recreate hash (or dbm) as:
sudo postmap /etc/postfix/sender-canonical

Specify dbm instead of hash if your system uses dbm files instead of db files. 
To find out what lookup tables Postfix supports, use the command 
"postconf -m".
But more importantly, see whether main.cf refer to hash:/etc/postfix/filename or dbm

Execute the command "postmap /etc/postfix/relay_recipient" 
whenever you change the relay_recipients table.
	eg of relay-canonical (tailing x means "checked" to allow domain to relay):
	@lbl.gov         x

	# added additional domain on 2020.0718, 
        # but not likely needed, as all email, even those to gmail.com, were forwarded to onward smtp server
	@berkeley.edu    x
	@es.net          x
	@nersc.gov       x



Execute the command "postmap /etc/postfix/transport" whenever you change the transport table.






main.cf


Example for cluster head node (which act as relay host for all compute nodes):



mydestination = $mydomain, $myhostname, localhost.$mydomain
mynetworks = 10.10.8.0/24, 127.0.0.0/8, 192.168.2.0/24
inet_interfaces = all
append_dot_mydomain = no
sender_canonical_maps = hash:/etc/postfix/sender-canonical
recipient_canonical_maps = hash:/etc/postfix/recipient-canonical
##
relayhost = smtp.na.skinforum.org
mydomain = na.skinforum.org
myorigin = headnode.na.skinforum.org





Example for node sending mail to be relayed.
SASL auth is turned off, ok only for private network with no possible outside access.



mydestination = $mydomain, $myhostname, localhost.$mydomain   
relayhost = 10.2.3.4:25
mydomain = gretadev 
mynetworks = 127.0.0.0/8 
smtp_sasl_auth_enable = no
smtp_use_tls = no                # DOE special anyway :p




Ref


interesting command and script to delete deferred mail.

http://www.cyberciti.biz/tips/howto-postfix-flush-mail-queue.html





















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