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: firstname.lastname@example.org root @mycluster.local @na.grumpy.com eg2: email@example.com 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
Copyright info about this work
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike2.5 License.
Pocket Sys Admin Survival Guide: for content that I wrote, (CC)
some rights reserved.
2005,2012 Tin Ho [ tin6150 (at) gmail.com ]
Some contents are "cached" here for easy reference. Sources include man pages, vendor documents, online references, discussion groups, etc. Copyright of those are obviously those of the vendor and original authors. I am merely caching them here for quick reference and avoid broken URL problems.
Where is PSG hosted these days?
http://tiny.cc/tin6150/ New home in 2011.06.
http://tin6150.s3-website-us-west-1.amazonaws.com/psg.html (coming soon)
ftp://sn.is-a-geek.com/psg/psg.html My home "server". Up sporadically.
http://www.fiu.edu/~tho01/psg/psg.html (no longer updated as of 2007-05)