Postgrey and the power of Greylisting to fight Spam

Sunday, March 13th, 2011

Wow…. Let me just say that I have typically been inundated with junk mail on my primary address. It’s associated with this domain and has been hosted in an older sendmail setup for quite some time (not really by choice, but because that’s what was installed on the old vps.) I’m currently migrating to postfix [...]

Zarafa Exchange Server replacement and Postfix Integration for multiple domains with unique users

Monday, April 27th, 2009

So, I’ve spent some time recently working with Zarafa. It’s an exchange replacement that has a completely open source version as well as a version with licenses for outlook if you want that level of integration. It’s web interface looks good and is an improvement on Exchange server’s capabilities with a non-IE browser. Anyway it [...]

Bellsouth/ AT&T mail problems

Wednesday, July 25th, 2007

I would dare say there are more than a couple people “out there” right now that are puzzled as to WHY some of their mail is bouncing back to them as being rejected. Right now I’m talking about Bellsouth / AT&T mail users…. it appears that this week AT&T is in the process of transitioning [...]

Blacklists and rejecting mail with Sendmail

Monday, January 22nd, 2007

A long time ago I had found how easy it was to reject messages outright with Postfix that came from non-existent domains. You know… junk from Well, since the mailserver at THIS site runs sendmail I wanted to fix sendmail the same as my home server. My home server is postfix based and uses [...]

More postfix spam blocking and Whitelisting….

Monday, January 22nd, 2007

I almost forgot to pass along a link to a more comprehensive detailing of postfix’s anti-uce controls…. here. Also, in the last article I briefly mentioned whitelisting. IF you intend to have several blacklists active it will pay to learn how to whitelist before you HAVE to. To do so, I simply created a text [...]

More postfix spam blocking….

Monday, January 22nd, 2007

Postfix has a NUMBER of tools for rejecting unwanted messages before they get in the door and waste your CPU time on deciding “hey this mail is spam”. Up until recently I’ve mostly used the check (which in the last couple months has now gone defunct.) When we started noticing problems with’s responsiveness [...]

Is something up with

Monday, December 11th, 2006

I’ve noticed several times in the last week a server of mine that is using postfix has rejected messages due to a failure in the lookup at At first, I thought this was just a false positive in the database at ordb… but this morning I finally “caught it” while it was happening and [...]

Mail command missing in ubuntu by default

Sunday, November 5th, 2006

Not really, news, but I was reminded again this evening that mail is not available at the command line in recent default installs of Ubuntu (or kubuntu /xubuntu). If you’re like me and make use of this for scripting notifications…. you’ll need to sudo apt-get install mailx (and a MTA like postfix.) Mailx requires postfix/sendmail/qmail [...]

Peculiar SPAM

Monday, August 22nd, 2005

I’m getting a new flush of strange junk mails the last day. Most have a subject of either “EIN (Einer!!) Menschenhaendler und Brandstifter laueft frei herum” or a slight variation “EIN Menschenhaendler (und Brandstifter) laueft frei herum” They all claim to be from “WWW daemon apache ”    Send article as PDF   


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