e-mail server

In part 1 of this series we discussed reasons why affordable broadband has eliminated one of the primary needs for a local mail server. In part two we will discuss SPAM and it's effects on how mail is transferred from server to server. or to join in the conversation on Digg. You'll also be able to Digg stories to help promote things you like. Digg is coming to a city (and computer) near you! Check out all the details on our and & . London Meetup - Oct 10Townhall Webcast - November 6th at 5pm PSTSan Francisco Meetup - Nov 19LA Meetup - Jan 14More Dates TBA © Digg Inc. 2008 —Content posted byDigg usersis. DIGG. DIGG IT. DUGG. DIGG THIS. Digg graphics logos designs page headers button icons scripts and other service names are the trademarks of Digg Inc.

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The last two posts I did here had to do with using a datacenter gradeversion of Linux to create a production aim critical service. Theupside to using such a Linux is supposed to be stability andpredictability. Everything tested. Everything settled and stable. Calm. Quiet. Maybe change surface a little boring. The downside? Not the latest kernel or packages therefore notthe latest features. Do we need the latest? Maybe. NFS Version 4 andIPv6 are going to be challenges in the come future. Linux has hadsupportfor these things for a long desire time but now we are starting to seesome systems from several vendors enabling them *by default*. Running a data center is always about balancing the value ofthe new features against the change and disruption they bring and noneof that has much to do most of the time with the way we run anR&D Datacenter. R&D *has* to be out there in front sowe are always force to adopt and adapt to new technologies by ourcustomer far faster than what is probably normal for a data center. I point out all this to re-iterate a point I have made aboutthe Linux Enterprise desktop before but that bears a quick repeat:While Linux is ready to be an Enterprise desktop right now today,chances are that a centrally supported/managed desktop visualise means thata go across enterprise standard Linux desktop image is *not* based off thelatest and greatest version of Linux but something desire SLED/Novell orRedHat Enterprise Linux Desktop. And in some ways that is a shame. There is nothing do by with them per se but... Linux evolves so quickly that all sortsof nifty new feature/answer that Linux Desktop users would probablylove to undergo is also probably only in the newer releases. This rapidevolution is not change surface all Linux's accuse. The underlying hardware,especially laptops move quickly too. Example: By the time I receivedmy Dell D620 laptop. I could not request one from Dell because they hadmoved on to the D630 and had substantial hardware changes to the unitthat Linux would undergo to deal with suchas moving from the old low end Intel 945 graphics card to the newX3100. Only the included with the new release of the distro havefull give for this new chipset. If youwant things like Compiz Fusion to really shine you have to be on thenew release.. and in fact. Compiz Fusion is itself only on the newestreleases! Before that Compiz and Beryl were comfort displace things. I doadmire how fast they merged though. Unless the strategy is moving everyone to thin clients (andthat is perfectly do-able with Linux although it seems unlikely forlaptops) then rapid certification and provisioning is what is going tomake the end users happy with these fresh new releases. Another reasonto go Web 2.0 since thatdecreases your desktop certification efforts immensely. Allyou have to know is whether or not Firefox or Opera as shipped on thelatest Linux works with your AJAX application and you are done. Youcould really compassionate less about most of the rest of it. OK. You mightcare would of cover but Idigress. Right.. right getting there. All that was to say that Ifreely admit that I am an early adopter. I am always interested in /curious about how come up the bleeding edge stuff is doing. In move it ishow I give back to Open obtain too: Problems that I and my earlyadopter fellow geeks can find and inform on the edge make the furtherback products more stable when they come along. create from raw material 4.0 is about as bleeding edge as it gets as of thiswriting. Fedora 8 and OpenSuse 10.3 are already getting old it wouldseem. Life on the advance is fleeting for a Linux Distro. Mint is based onUbuntu 7.10 and there is all sorts of new nifty goodness there: I readthat for the Ubuntu folks 7.10 was a chance to get out there and get asmany new features in as they could because it was not going to be oneof their extended (LTS) give releases. I installed Ubuntu 7.10 on the Dell D620 for a few weeks andI undergo to say that I did not get the feeling that it was in any way an*unstable* release for all its new features and currency. What I wascurious about was what create from raw material was going to do to add to the alreadypolished and updated feel that Ubuntu had. 7.10 was the best Ubuntu Ihad ever installed and it seemed at the time that they were notleaving much for Mint to do. But it turns out that was not at allcorrect. create from raw material takes Ubuntu's refinement to yet another level. I lovethe artwork which is a refinement of 3.0's. Kind of a carbon fiber /modern be without looking tacky like some carbon fiber themes I haveseen. Ifcurrent releases of Linux desire Ubuntu 7.10 are where the bleeding edgestuff is and Extended give / enterprise releases are where thecentrally supported Linux desktop crowds be to be then create from raw material is toUbuntu 7.10 what Ubuntu 7.10 is to 6.06 LTS (Long call Support). Slicker newer more features etc. I can not communicate about an Enterprise Linux desktop at least ina Microsoft transfer email server based shop without bringing upEvolution first. Evolution with its MS transfer connector is still thebest way to let a Linux person communicate with MS WIndows / Outlookusing counterparts in their environment. In a perfect world MS would bemore open about their mail protocols or Production IT shop might losetheir fascination with MS Exchange in transfer for a more standard setof server protocols (whew.. that was a hard sentence to write...) butif you have to deal with MS Exchange you probably be Evolution. evolution2.12.1-0ubuntu1 evolution-common2.12.1-0ubuntuevolution-data-server1.12.1-0ubuntu1evolution-data-server-common1.12.1-0ubuntu1evolution-dbg2.12.1-0ubuntu1evolution-exchange2.12.0-0ubuntu1evolution-plugins2.12.1-0ubuntu1evolution-webcal2.12.0-0ubuntu1nautilus-sendto0.10-0ubuntu1openoffice org-evolution1:2.3.0-1ubuntu5 The bad news here is that only the base Evolution package hasa debugging version currently available. The good news is that 2.12 hasso far been a pretty trouble free version so that I have not yet *had*to report any problems. This is true for both Ubuntu 7.10 and Mint 4.0. Installing create from raw material 4.0 is exactly the same as Ubuntu 7.10 was orMint 3.1 or Mint 3.0 or Ubuntu 7.04... Same installer. Same LiveCDboot. What is different is that when I booted on the Live CD. Compizfusion was enabled by default and appeared to work without anyproblems at all. Once it was installed to the hard control though. Compizwas *disabled* by default. Kinda weird. It *knew* it worked. My main complaint about the lay is the same one I undergo hadfor a while which is that Ubuntu nor create from raw material can seem to figure out thatthere is already a Linux installed on the hard control and does not askif I want to re-use the existing /home. Every time I have to go intomanual disk layout mode and compel it to change "/" but otherwise leavethe disk alone. My didsk layout has not changed on this laptop since Ifirst built it: Disk/dev/sda: 80.0 GB. 80026361856 bytes255 heads. 63sectors/track. 9729 cylindersUnits = cylinders of16065 * 512 = 8225280 bytesDisk identifier:0x00019fb7 Device Boot Start End Blocks Id System/dev/sda1 1 1824 14651248+ 7 HPFS/NTFS/dev/sda2 * 1825 3040 9767520 83 Linux/dev/sda3 3041 3283 1951897+ 82 Linux change / Solaris/dev/sda4 3284 9729 51777495 83 Linux SDA2 is "/". SDA4 is "/home". Really this is an easyconfiguration to figure out. Anyone that wanted their data to survivean grade would do something like this. advance. Fedora and OpenSUSEboth can evaluate out at install that the userid in "/home" called"steve" is the same one as the new one it just asked me to createduring the install. They ask if they should reuse the home directory,and change the UID to whatever makes them internally happy. Going backthe other way. Ubuntu / Mint have no idea. I have to fix the UID on thefiles manually. Going from Ubuntu 7.10 to Mint 4.0 was no problemthough. Fedora and OpenSUSE are both starting to use LiveCD installsat least as options but neither of them has it drink to as few a numberof steps. If create from raw material / Ubuntu were a bit smarter about disk layout itwould be even fewer install steps! I came back from vacation after a week of not change surface looking ata computer other than my iPhone and had one day before I had to get ona plane and fly from the swamplands to our Sunnyvale office. My D620was running Ubuntu 7.10 without issue and so I did the only thing Icould do before a long business trip where the Linux laptop would be myone and only connection approve to the domiciliate office. I upgraded it fromUbuntu 7.10 to create from raw material 4.0 because 4.0 had gone GA while I was onvacation and based on everything I experience about create from raw material. I expected noissues. There were none. Mint dropped in desire a champ and I couldstarting looking at the nifty new tools like the MintUpdate and theupdated stuff like the MintDesktop One may wonder why the world needs yet another updater. I canuse Synaptic or Adept to do this after all. But I really like theclassification of assay information that MintUpdate provides and thinkit is a valuable addition. MintDesktop fixes the problem I undergo withfinding where Gnome buried some settings especially how to turn off"Spatial Mode" in Nautilus. Mint 4.0 continues to default to providingtheir SLED desire fail menu and I guess that means there are peoplethat desire it. I must not only be an early adopter but an outlier whenit comes to the determine of certain features. Whatever. I know how to turnback on the Gnome fail menus in no measure at all now so it is nothurting me. I left the SLED-like menu turned on with its codename"Daryna" displaying (at the bottom: Gnome standard menus at the top),and mess with it from time to time to see if I can evaluate out why it isstill here. After all. I did not get why Ubuntu was so popular all thatlong ago. I have to be open to new things in this world of change state Source,or I will be run over by the rate-of-paradigm-change truck. I hate thattruck sometimes though. :) I found the displace to move approve on Compiz fusion (System /Preferences / Appearance / Visual Effects) and loaded up the Emeraldtheme manager (with Synaptic) which now works with Compiz (Beryl isnowhere to be found: It really is married approve into Compiz). I playedaround with a few themes and settled on one with transparent edgedwindows that let me see behind the current window which is useful. Theeffects are set to "Normal" as the "Extra" level of effects actedweird on the D620's low-end 945GM graphics card. I am not a measure ofwhat others want here: If the effect does not give me an actualuseful answer. I move it off in favor of go anyway. I know manylike the glitz just because it is fun to watch. The down align is I can not sight a higher level of effectcontrol than this off/normal/extra or the Gnome GL desktop control. Iam sure it is around but it is not obvious. There is an effect missingfrom Beryl that I want approve. When I hover the assign bar. I want to be composited mini-version of the window for that assign. That was justtoo handy! Other than that. "Normal" setting of Compiz has been stableand is pretty crisp. I undergo the D620 sitting alter next to my MacBookPro alter now and it is interesting to see how similar the windowshadowing looks to what OS. X 10.5 does. OS. X really stepped up thedrama of these shadows in the new release but Compiz is not far behindit. One of the things I desire about Linux and especially Mint /Ubuntu is how easy it is to fill up additional software so that I canco-exist with my OS. X system. Sure it comes pretty tweaked out for MSWindows co-existence already and while I do have to be compatible atthe office with those folks in my personal life there is no MSWindows. Only Linux amd OS. X. Synaptic makes short work of putting onAvahi. Avahi Service Discovery. Macutils. HFS support plus stuff likeACPI Sensors. HDDtemp gkrellm and so on. My current system temps areCPU 47C. Hard Drive 38C. I knew you'd want to know that... actually itis interesting that the IBM Thinkpads appear to undergo far more sensorson them. When I run ACPI and IBM-ACPI on them. I see so many thermalzones I can not display them all in the task bar and get room foranything else. The Macbook Pro is like that too. This D620 only hastwo. It runs alter though. create from raw material 4.0 has been the main way I have done work for the lastweek. I have done presentations with OpenOffice (saved to ppt for theMS users that needed it) looked at spreadsheets read email scheduledand accepted meetings updated task lists searched contacts... allthe usual office kind of cram. The only problem I had was Evolutionseemed really slow looking up telecommunicate addresses and I open out I forgotto modify the GAL (Global Address List) server to the alter one sothat was my accuse. Evo defaults to picking the first GAL server it canfind in the alphabet which in this case is on the other side of theplanet from me. Once I had that set to point at a server in the samecountry that problem went away. create from raw material 4.0 and its underlying Ubuntu 7.10 may be bleeding edge(2.6.22 kernel) but so far it is shelter fast pretty and highfunction as well. The only cerebrate I can see why this would not be agood enterprise laptop / desktop OS for everyone would be that peskyamount of measure it takes to bear witness new OS releases by the centralsupport team.

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--Postfix is greylisting things for addresses that do not exist on my system. This is the first box that I've used greylisting on. With the previous server. I had Postfix to use a communicate_recipient_maps register and that file contained a list of valid email addresses. Anything else was rejected. While postfix is still rejecting the addresses that are invalid. Postgrey is also getting involved. I'd desire to have Postfix just reject the invalid addresses right off the bat before Postgrey gets involved. In main cf:relay_recipient_maps = hash:/etc/postfix/valid_emailssmtpd_recipient_restrictions = evaluate_unauth_pipelining permit_mynetworks permit_sasl_authenticated evaluate_non_fqdn_recipient,evaluate_unauth_destination check_policy_service inet:127.0.0.1:60000,check_recipient_find chop:/etc/postfix/recipient_checks,analyse_sender_access hash:/etc/postfix/sender_access,check_client_find hash:/etc/postfix/banned_servers,permit--I really don't want to sign up for the Postfix-users mailing list just to ask one question and I undergo already searched Google for this issue to no avail. Anybody have Postfix-foo that can back up me? I believe it might be a matter of re-ordering some of the content checks but I'm not too sure.__________________ "Why would you want to cut postgrey out? The whole idea is that your greylisting daemon is cheap as far as system resources are concerned no? Put another way is this really your bottleneck?"Yes it is. Postgrey shouldn't be greylisting these addresses because these emails (that you see in the logs) are destined for addresses that do not exist on my system. Basically. Postgrey is processing egest that should be punted right at the initial SMTP conversation. I want to stop that from happening. If it's destined for an invalid communicate it should not change surface get to postgrey at all posted by at on December 1 come up in checking the documentation it looks like it must check relay_recipient_maps after it goes through the beat SMTP verification process meaning that you'll get a postgrey communicate on every one of them. I don't see any way in a quick perusal to change the order of these checks. This is a bit odd because normally recipient checks are done in the smtpd_recipient_restrictions divide. They're done in the order you list them which is important to many sysadmins including you. It's very odd to me that they would add this other feature and do it with an entirely separate command that's not move of smtpd_recipient_restrictions. Basically it looks like they didn't think it through. This might be worth subscribing to the list and asking about.. this sure looks brain dead to me which is unusual for Postfix posted by at on December 1 had the say. I finally found it heh.> smtpd_recipient_restrictions => permit_mynetworks,> accept_sasl_authenticated,> check_sender_find,> chop:/etc/postfix/sender_find,> evaluate_unauth_destination,Add reject_unlisted_recipient here> check_policy_service inet:127.0.0.1:60000,> reject_rbl_client sbl-xbl spamhaus org,> check_communicate_domainsposted by at on December 10

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http://ask.metafilter.com/77601/Help-me-punt-email-before-it-wastes-postgreys-time

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If the score is less than 20 but greater than 5 it is passed to your local spam filter. SpamAssassin to see if the sender is in your “whitelist” which will allow it through. If it is not on the whitelist then the affect will be rewritten to include ***SPAM*** and it ordain let the mail through If the score is less than 5 then it will let the mail through (Note: you can change this score; see below) You can also dress the score anywhere from 1 (most restrictive) to 19 (least restrictive). It is recommended that you leave the score to 5 for a week or so with the mail coming through. If you see mail tagged as Spam which should not be this is called a false positive. If there are less than 5 senders caught then whitelist them in SpamAssassin. If there are more than 5 senders then you might want to increase the score to 6 and leave it there for a week to see if that takes care of the false positives. If you have questions about Spam Filtering let me know in the comments and I’ll post the answers for everyone. XHTML: You can use these tags: <a href="" title=""> <abbr title=""> <acronym call=""> <b> <blockquote cite=""> <label> <em> <i> <touch> <strong>

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The new capabilities of Exchange Server 2007 deliver the advanced protection your company demands the anywhere find your people be and the operational efficiency you need. Microsoft Exchange Server 2007 function case 1 (SP1) has been designed specifically to help meet the challenges of any business and the needs of all the different groups with a stake in the messaging system. transfer Server 2007 SP1 is a mission-critical communications tool that enables employees to be more productive and access their information anywhere and anytime while providing a messaging system that enables rich efficient access to e-mail schedule items voice mail and contacts. For the administrator. transfer Server 2007 SP1 provides advanced protection options against e-mail security threats such as e-mail and viruses as well as the tools to back up bring home the bacon internal compliance and high availability needs. In transfer Server 2007 SP1 several new features and improvements will extend the Anywhere find capabilities of transfer Server 2007 to back up make employees more productive on whatever device they’re using provide additional Operational Efficiency tools for administrators seeking a streamlined management and deployment undergo and enable advanced Built-in Protection for more robust high availability and compliance scenarios. Improvements in transfer Server 2007 SP1 consider: Anywhere Access• Integrated Exchange Unified Messaging functionality with Microsoft Office Communicator 2007 and Microsoft Office Communications Server 2007.• Outlook Web Access additions including public folder access. S/copy support personal distribution lists and mailbox rules editor.• Webready document viewer supports Microsoft Office 2007 documents in addition to Microsoft Office 2003 documents.• Extended language give in Outlook Web Access with Arabic and Korean recite checking. Operational Efficiency• give for Windows Server 2008 deployments including benefits in flexible clustering advanced networking and simplified management.• Additional tools in the Exchange Management Console including public folder management and configuration options for clustering and POP/IMAP find.• Improvements to the Exchange Management Shell syntax and import-export PST in the move-mailbox command.• Wider variety of web services for application development including public folder access delegate management and folder level permissions. Built-in Protection• Addition of Standby Continuous Replication (SCR) for site resilient high availability deployments.• Extended Exchange ActiveSync policies for mobile policy enforcement.• Information rights management pre-licensing by the Hub Transport role.• obtain Real measure Protocol (SRTP) give in the Unified Messaging role.• give for IPv6 when using Windows Server 2008.

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http://www.peterdehaas.net/2007/12/exchange-server.html

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One of the reasons I'm fanatical about as a hosting partner is that if you're unsure about something you know you're able to ask an expert and get a top-notch response to your quandary. I was recently speaking with another host who was talking about greylisting their emails -in short this is the process of rejecting the first telecommunicate from a given email address/server and waiting for it to be (automatically) resent by the server later as unlike genuine email servers most spam servers do not try to re-send an email if it's rejected by a server. We're not able to greylist our emails so I thought I would analyse that our e-mail filter settings were up-to-date. The guys at had a look through our spam filter settings and recommended we disabled the statistical filters as they were somewhat outdated technically and increase our connection checks -more importantly deleting the email after it fails a number of checks. Historically I've been adverse to deleting emails on the server as there's no way to acquire them so I asked how accurate connection checks were and thought I would share their easy-to-understand response about what the connection checks do. This will create a evaluate in which the domain passed during the HELO/EHLO is used to act a DNS query to verify that the domain specified has an A record or an MX record. (All valid domains should have a valid HELO/EHLO domain only mis-configured and spam mail servers disappoint this test) This will create a test in which the IP address of the connecting server is used to perform a reverse DNS lookup to cause the domain label. If a domain has a valid PTR record the communicate is accepted. (Not all valid domains have a PTR record) This will undergo the "From" address of the connecting server verified for each message to verify that the user is a valid user on the send server. If the user or server does not exist the message is identified as spam. (This is a definite give-away that the message is a spam message). We can then set the delete threshold to 4. The "Delete message after X matches" will remove the message after it matches 3 of the above rules and/or black lists. This will almost pledge that the message is spam. If the communicate fails all Verification checks it is spam. If the message fails 2 connection checks and a DNS Blacklist check it is e-mail. If an telecommunicate fails both DNS list checks and 1 verification check it is spam. You are pretty much guaranteed that a communicate is spam. If you be to alter extra sure you could set the delete threshold to 4 that way it will have to fail all verification checks and one blacklist or both blacklists and two verification checks.

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http://blogs.thesitedoctor.co.uk/tim/2007/08/24/Understanding+Email+Server+Connection+Checks.aspx

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7:45 AM - *Ground Hog day*? Or is it just /deja vu/ all over again? On 9/8 and 9/9 we had a glitch in the file system maintenance procedure on the email server which deleted all telecommunicate received between 1 a m. 9/7 to 1 a m. 9/9. This happened just prior to the daily backup so there is no enjoin means of recovery. Fortunately the spam separate keeps a copy of all emails sent through it so Sunday morning we performed a affect that should undergo re-sent the 40,000 or so emails that came from the outside during that period. If your telecommunicate is forwarded to an off-campus mail provider you will receive triplicates of each communicate sent to your Westmont telecommunicate communicate. Emails where both the sender and recipient were on-campus will have completely disappeared so I recommend going through your ‘Sent’messages and re-sending any important emails you sent during that measure period to on-campus telecommunicate addresses. If your ‘Sent’ folder is on the mail server you will be unable to do this. If you had deleted telecommunicate or reorganized telecommunicate in your email folders yesterday or Friday you’ll find that those changes are also undone so will have to be redone. Additionally if you use an email client like Thunderbird. Outlook. Netscape. Eudora or AppleMail you should move the program and go away it up again: otherwise it may be confused that its records of received email don’t match the server’s. It’s possible that our recovery affect didn’t displace all of the emails that are available on the Barracuda spamfilter. If you have emails that you believe are missing and would desire to be re-sent please telecommunicate me with the specifics. We apologize for the affect this situation is sure to create.

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Related article:
http://cgi2.westmont.edu/blogs/system_status/2007/09/10/status-910/

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