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Monday, February 20, 2006

Exim - the MTA that makes me go googly-eyed!
(posted at 10:02PM GMT)

It isn't often that I go all gooey-eyed at a piece of hardware or software but you will find that for some people, it takes pure eye candy such as the latest beta of Windows Vista (hi Steve!), sheer ease-of-use such as Mac OS X or even the framerate of the latest 3D first-person-shooter.

For me, eye candy is nice (hell, I run an iMac as my primary desktop - pretty much because a G5 is the cheapest way of getting a 64-bit machine running an accelerated 2D desktop that has a decent implementation of X11), ease-of-use doesn't really bother me as I grew up writing scripts and didn't touch a mouse until I was 14... as for framerates, I only really play Unreal Tournament (the original!) and that runs like a dream on any low-end machine nowadays.

Nope, the kind of software which makes me drool is stuff such as Exim; an MTA which runs on UNIX systems but is the most infinitely configurable MTA on the planet - the configuration can be changed dynamically at runtime based on external criteria such as the contents of a MySQL table and anything which can be executed as a simple script (for example, you can change mail routing based on time of day or route large bulky items over a secondary link so as not to max out a primary link).

Best of all, this software is completely free.

The really ironic thing is that I have been using this software ever since the author released Version 4 (Exim is now up to Version 4.60) and in all this time, I really don't think I have even scratched the surface of what this MTA can really do.

My configuration is now just over 100+ lines but it filters out malware, routes mail for over 2,000 domains, rewrites addresses using an alias table of just over 12,000 entries and performs dynamic host routing based on the contents of a constantly-updating MySQL table (often updated once a minute!).

I don't think I could get the level of performance and flexibility that I currently achieve with Exim from any other MTA although Courier-MTA does a splendid job regarding end-user filtering; maildrop is such a pleasure to code for and as maildrop is so well integrated with Courier-MTA, etc, etc.

So... thanks again to Philip Hazel (the individual who authored Exim) and the countless other contributors such as Tom Kistner who authored the totally excellent Exiscan-ACL patch that performs on-the-fly malware detection... you guys rock!

Thursday, February 9, 2006

A quick roll call...
(posted at 10:10PM GMT)

I'm currently enjoying my new self-employed status; as a direct result of all the extra time available to me, the development of the new dspam cluster is way ahead of schedule (originally specced for end of May but should be with spilsby.net customers by the beginning of April) with the new billing system ready by the beginning of March.

Once the dspam cluster is up and running, I'll be deactivating the spamassassin cluster once I am satisfied all is running okay.

It has now been just over a week since I officially left the ICT Department at Linkage and since then, the following systems are no longer working:

* OWA at Toynton Campus is broken (connections to the IIS service on that box are being rejected).

* General Internet access.

Also, someone really did the department proud by breaking automatic proxy detection (ever heard of option-252 ?) and I especially liked the mail which went out to everyone:

'If you can't access the Internet and your Automatic Proxy detection box is ticked, please untick it but if it is already unticked, please tick it.'

WTF !?!?!?!

As someone who worked on an ISP helldesk for three years, there is a far easier way of doing that without pissing off 1,000+ users in the process... ever heard of the IEAK ?

This is why Microsoft zealots really wind me up; they should at least have the decency to learn the tools of their trade and figure out how to get their workstations to auto-configure rather than ask the users to do it for them... or is it just because their learning curve is so limited and they are generally resistant to anything 'new' ?

I was also amazed to learn that someone in the department who shall remain nameless has been moving student mailboxes over to a Microsoft Exchange server that only has an ADSL connection with only 256Kbit/s upstream connectivity.

This was brought to my attention by one of my evening class students on Tuesday evening who had been complaining that his mail was taking forever to load now and apparently he didn't know that the server was on an ADSL connection, because, once I told him, his exact words were, "... but that's stupid!".

... and as for the comment in the mail about developing an in-house support tracking application, they really need to get their priorities straight:

FACT: They are short-staffed.

FACT: They have one individual doing the work of three people... an individual who recently collapsed during the working day, probably due to stress and exhaustion.

(EDIT: This has now been confirmed by a local hospital!)

... and their solution is to devote already scarce staffing resources to developing an application which makes it easier for other staff to pile even more work on to him!

The worst thing about this is that I initially felt guilty for leaving the ICT Department as I felt that if I had been there, he wouldn't have been overworked/stressed and therefore wouldn't have collapsed but in hindsight, I don't feel guilty, I feel anger towards the individual who 'managed' that workload onto him as the individual could have done a lot more to ease his burden.

Although, I'm quietly confident that some sanity, might, just might, be restored to the ICT Department very very soon...

 
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