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Python, Lua, Tcl, C and C++ training - public course schedule [here]
Private courses on your site - see [here]
Please ask about maintenance training for Perl, PHP, Java, Ruby, MySQL and Linux / Tomcat systems
 
Email metrics and filtering

Graph of spamEvery few minutes, a spam email drops in my mailbox ... and indeed every five minutes or so throughout the day, our server rejects an email that is so obviously, undeniably spam that it doesn't even bother to notify us of its arrival. This is a long-running graph showing spam (red) and delivered to our mailboxes (blue) on a daily basis. Our filters are tuned to pass things through to us if there's any doubt - we're an organisation that welcomes new customers, and they often introduce themselves by email, and with a none-obvious title line (such as "Hi").


A gap in the SpamBut looking at my inbox this morning, there's a gap of over an hour when I didn't get a single email! Oh - I see - it's spring and the clocks have gone forward ... and that was the missed hour.


We use SpamAssassin to do our primary filtering, and a Perl script run within our mail client to then log the emails marked as Spam. The graph at the top of this item is produced by the gd module running within PHP. I wouldn't advocate that customers follow our lead and mix languages like this - we've used them both because we provide both Perl Programming Courses and PHP training classes ... using both languages ourselves for real solid and substantial work.
(written 2010-03-28)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
G909 - Well House Consultants - Spam, Spamming and Spammers
  [4520] No cold sales calls please - but delighted to hear from others! - (2015-09-29)
  [4315] Welcoming genuine forum posters quickly - but turning away off topic advertisers - (2014-11-16)
  [4135] Introducing your product to Well House Consultants - single, personally tuned email please - (2013-07-08)
  [3946] Moving from a warning system to a control system - PHP, forum spammers - (2012-12-07)
  [3912] Sand to Arabia, Coals to Newcastle or Woodburners to Russia - (2012-11-04)
  [3910] Identifying your real customers and keeping them well informed fast - (2012-11-02)
  [3661] Keeping forum and blog comments clean - (2012-03-19)
  [3506] Cold call contacts - preference services and turning off spam sales approaches - (2011-11-03)
  [3352] World Trade Register - Certainly NOT worth 2985 Euros. - (2011-07-09)
  [3316] Twitter Phishing Trips ... and a great new alert service - (2011-06-04)
  [3190] What do the following web sites have in common? - (2011-03-03)
  [3166] Well house is strong - confirmed? - (2011-02-11)
  [3016] The legal considerations of your web presence - revisited - (2010-10-26)
  [2884] Hotlinked images onto adult material sites - (2010-07-23)
  [2398] Websitemediasolution and a goldfish called Carl Johnson - (2009-09-06)
  [2276] Who is Marc Schneider of Multilingual Search Engine Optimization Inc - (2009-07-10)
  [2179] Offers that I can refuse - (2009-05-12)
  [2177] Preventing forum spam - checks at sign up - (2009-05-12)
  [2019] Baby Caleb and Fortune City in your web logs? - (2009-01-31)
  [1978] From spam to mod_alias - finding resources - (2009-01-05)
  [1817] Marc Schneider is still having email trouble - (2008-09-30)
  [1763] Co-operating to save, yet we dont - (2008-08-21)
  [1532] Comment spam blocked. Please comment via Forums - (2008-02-05)
  [1523] Ive just received an email from myself. Should I be worried? - (2008-01-29)
  [1115] Unexpected visitors to our site - (2007-03-22)
  [1037] Impact Engineering and Backscatter - (2007-01-16)
  [872] Email metrics - (2006-09-20)
  [495] More spam - a success story - (2005-11-13)
  [417] Telephone Preference Service - we're registered - (2005-08-17)
  [347] Frightening and from-friend viruses and spams - (2005-06-14)
  [338] OO techniques are hard to teach - (2005-06-06)
  [276] An apology to Mr Boneparte - (2005-04-11)
  [268] Information request forms, cleaning up spam - (2005-04-05)
  [259] Responding to spam - (2005-03-27)


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Some other Articles
Is Lua an Object Oriented language?
The same very simple program in many different programming languages
Lua tables - they are everything
Ruth Davis, 1916 - 2010
Email metrics and filtering
Garlic bread without garlic
TCP v UDP / Client v Server - Python examples
Multiple processes (forking) in Python
Methods that run on classes (static methods) in Python
Flexible search and replace in Python
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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