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OT: Extracting Subject Lines from IMAP Mailbox
by Tim Evans 16 Feb '15

16 Feb '15

Looking for a command-line way to extract only the Subject lines from my mailbox on my ISP's IMAP server, without actually downloading/modifying the contents of the mailbox. Sort of the remote equivalent of locally doing: $ grep ^Subject /var/spool/mail/mymailbox > subjectlistfile Thanks. -- Tim Evans | 5 Chestnut Court UNIX System Admin Consulting | Owings Mills, MD 21117 http://www.tkevans.com/ | 443-394-3864 tkevans(a)tkevans.com

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CentOS6 box fails
by Chris 16 Feb '15

16 Feb '15

Dear All, I used to use CentOS 6 on my desktop without any issues until this morning. Booting stops after the libvirt-guests and certmonger init script. I don't start any guests at boot-time. In rc3.d is only the S99local script after certmongers. Normally, I just suspend this box, so I'm not sure when I rebooted it last time successfully. Does anyone happen to know why booting stops? I haven't found any hints in /v/l/messages. I think I have to reinstall this machine. -- Gruß, Christian

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CentOS 7 on dual-monitor workstation?
by Niki Kovacs 16 Feb '15

16 Feb '15

Hi, My workstation is currently running Slackware Linux 14.1 64-bit, and I'm considering replacing that by CentOS 7, which I've already installed on my laptop. The PC has an NVidia GeForce GT 520 video card with two 19'' monitors attached to it. I'm using the proprietary 'nvidia' driver. I vaguely remember having read somewhere that RHEL/CentOS 7 with GNOME 3 had trouble with dual monitors. Now since this is my main workhorse PC, I thought I'd rather ask before migrating, just to be on the safe side. Anybody on this list running CentOS 7 on a similar hardware configuration? If I remember correctly from the time spent with CentOS 5.x, the proprietary 'nvidia' drivers are best configured using the third-party ELRepo package repository. Correct me if I'm wrong. Cheers, Niki -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Teaming on qemu.
by dE 16 Feb '15

16 Feb '15

Hi! For testing purposes, I'm trying to setup teaming on my VM which runs CentOS 7. I've 2 gigabit NICs emulated which are connected to a tun device on the host. I can ping to the tun device on the host when directly using the interface (of course when teaming is disabled), when using the team interface, I can't. The team link is made as such -- teamd -f /etc/teamd.conf Contents of teamd.conf -- { "device" : "team0", "runner" : { "name" : "roundrobin" }, "ports" : { "enp0s3" : {}, "enp0s4" : {} } }

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Custom wallpaper on CentOS 7?
by Niki Kovacs 16 Feb '15

16 Feb '15

Hi, I just installed CentOS 7 + GNOME on my Asus S300 laptop. So far everything runs very nice and smoothly, and I'm quite happy with it. Curiously enough, I can't seem to be able to set a custom wallpaper. I tried various locations like /usr/share/backgrounds, /usr/share/backgrounds/gnome and /usr/share/backgrounds/images, but the images don't appear in the wallpaper selection window. Any suggestions? Cheers, Niki Kovacs -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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LC_COLLATE variable?
by Niki Kovacs 16 Feb '15

16 Feb '15

Hi, I'm running my CentOS 7 desktop in french. LANG is set to fr_FR.UTF-8. In GNOME 3, the menu entries are listed in alphabetical order. Unfortunately, entries beginning with an accented character (like "Éditeur de texte") appear at the bottom of the list. I know that in order to correct this, I have to set the LC_COLLATE variable to fr_FR.UTF-8. What would be a sensible place to do this system-wide under CentOS 7? Cheers, Niki -- Microlinux - Solutions informatiques 100% Linux et logiciels libres 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Centos 7.0 and mismatched swap file
by Gregory P. Ennis 16 Feb '15

16 Feb '15

Everyone, I am putting together a new mail server for our firm using a SuperMicro with Centos 7.0. When performed the install of the os, I put 16 gigs of memory in the wrong slots on the mother board which caused the SuperMicro to recognize 8 gigs instead of 16 gigs. When I installed Centos 7.0, this error made the swap file 8070 megs instead of what I would have expected to be a over 16000 megs. I am using the default xfs file system on the other partitions. Is there a way to expand the swap file? If not, then is this problem sufficiently bad enough for me to start over with a new install. I do not want to start over unless I need to. Thanks for you help !!! Greg Ennis

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Re: [CentOS] Centos 6 Sendmail backup MX Config
by James B. Byrne 15 Feb '15

15 Feb '15

On Fri, February 13, 2015 12:52, Les Mikesell wrote: > On Fri, Feb 13, 2015 at 11:39 AM, Valeri Galtsev > <galtsev(a)kicp.uchicago.edu> wrote: >> >>> Otherwise it accept junk that your primary rejects >> >> Not exactly. If greylisting on primary is set, but on backup MX >> is not, still what is killed by greylisting by primary MX, >> almost never will come through backup MX. This is due to the >> same reason why greylisting is efficient: it trows off all that >> doesn't behave as mail server (thus never comes for re-delivery, >> and definitely doesn't try backup MX which real servers always >> do even before attempt of re-delivery). > > I'm not convinced. Spam is big business and trying a 2nd MX is cheap. > Much spam/ucem is deliberately sent directly to the lower priority MX host from the outset on the assumptions that: 1.) the secondaries will be less well configured to detect SPAM to begin with; and 2.) once mail is routed though an officially recognized secondary host then the primary is less likely to treat such traffic as SPAM. We run grey listing and amavisd (clamd/spamd) on all of our MX servers because of this practice. We also list several non-existent MX secondaries at the lowest priority to cheaply pick off the really stupid points of origin. Yes we do get rejects for real correspondents. A notable recent victim, if such is the right word to describe a self-inflicted injury, was ibm.com. Who, in contravention of rfcs 7208 and 7372, both configured eleven MX hosts for their domain AND enabled SPF. This causes an immediate permerr with anyone checking SPF as the maximum number of MX hosts allowed with an SPF enabled domain is ten. But, who am I to tell IBM how to configure a computer? On the other hand, we also have large organizations who use smtp pools and with these grey-listing simply does not work. Each subsequent attempt to connect can occur from any of the IPs in that pool and the mail either never gets through or is seriously delayed. For those cases we are constrained to use white-listing. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] Centos 6 Sendmail backup MX Config
by James B. Byrne 15 Feb '15

15 Feb '15

On Fri, February 13, 2015 10:57, Ken Smith wrote: > Hi All, > > I'm just wanting to check that my understanding of the settings is > correct as my web searches are finding a lot of dated information. > > If I want a Centos 6 sendmail system act as the secondary MX for > domain > bbbbb.co.uk do I just add a > > Connect:bbbbb.co.uk RELAY > > statement into /etc/mail/access and restart sendmail > > Obviously I have the DNS MX records for the domain are already > established. > > I've been getting "/config error/: /mail loops back to me/ " errors. > > I think I may be stumbling into a variant of cname problem where the > hostname as far as the sendmail machine is concerned is aaaaa.com but > the DNS setting for the secondary MX is smtp1.bbbbb.co.uk. > > They both resolve to the same IP but when sendmail looks up the MX > records for bbbbb.co.uk it will find smtp.bbbbb.co.uk and > smtp1.bbbbb.co.uk listed and it may relay the mail off to > smtp1.bbbbb.co.uk without recognising that aaaaa.com = > smtp1.bbbbb.co.uk. Am I on the right track here, as I then just need > to > change the secondary MX setting in DNS to aaaaa.com? When I set up secondary MX services in Sendmail (and Postfix) then I always use the direct address feature of the domain routing table and avoid looking up MX RRs altogether. After all, if the mail arrived here it is a good bet that the main MX is off-line (or this is SPAM/UCEM but that is another issue). So assuming that the primary MX host is mx10.example.com and the secondary is mx40.something.else then with Sendmail the file /etc/mail/mailertable on mx40.something.else should contain something like this: example.com. esmtp:[mx10.example.com] .example.com. esmtp:[mx10.example.com] The [] brackets prevent MX lookups and just routes the message traffic directly to mx10.example.com as soon as a connection can be made. This prevents the most common source of mail loops where the primary is off-line and so any mail is bounced back to the backup MX, which just happens to be the host that just sent it, thus causing the loop. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Updated Spam Assassin for CentOS 5...
by Robert Heller 15 Feb '15

15 Feb '15

I am wondering about updating the version of Spam Assassin on my CentOS 5 mail server. The current version, 3.3.1-4.el5 (stock RHEL version), has been 'leaking' recently. I suspect I need some newer match rules to detect some of the newer flavors of spam. I see that in rpmforge's extras repo is version 3.3.2-4.el5.rfx -- is this version worth installing? Are there even newer versions either available for CentOS 5 (or buildable under CentOS 5)? Or is there a collection of match rules available for the newer flavors of spam than can just be dropped into /etc/mail/spamassassin/local.cf? I am not ready just yet to migrate my server to CentOS 6 (but that is something I'll probably do at some point). -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller(a)deepsoft.com -- Webhosting Services

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