config files in /etc/postfix main.cf logs in /var/log/maillot 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: email@example.com root @mycluster.local @na.grumpy.com eg2: firstname.lastname@example.org 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". 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.cfExample 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.orgExample 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
Refinteresting command and script to delete deferred mail. http://www.cyberciti.biz/tips/howto-postfix-flush-mail-queue.html
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