Monthly Archives: August 2012

Postfix 2.9 Upgrade — I’ve previously written a how-to for compiling Postfix from source on a CentOS 5 box. I recently tried following the same steps on a CentOS 6 box, to upgrade from Postfix 2.6.6 which is installed by default. I’m glad to report that the same instructions will work just fine to upgrade […]

Building Postfix 2.10 on RHEL6 / CentOS 6 from Source

This entry was posted in Linux Reference Technology and tagged binaries build CentOS CentOS 6 compile Postfix Postfix 2.6.6 Postfix 2.9 Redhat RHEL RHEL 6 rpm source on August 20, 2012 by Steve Jenkins (updated 4332 days ago)

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If you’re getting “temporarily deferred” Postfix log entries when trying to send mail to Yahoo! that look like this: host mta7.am0.yahoodns.net[66.196.118.34] refused to talk to me: 421 4.7.0 [GL01] Message from (xxx.xx.xx.xxx) temporarily deferred - 4.16.50. Please refer to http://postmaster.yahoo.com/errors/postmaster-21.html or status=deferred (host mta7.am0.yahoodns.net[66.196.118.35] said: 451 mta1336.mail.bf1.yahoo.com Resources temporarily unavailable. […]

How-To: Postfix configuration to reduce Yahoo temporary deferrals using Transport ...

This entry was posted in Linux Reference Technology and tagged 420 421 deferral GL01 Postfix refused to talk to me Resources unavailable temporarily status=deferred temporarily deferred Yahoo Yahoo Mail yahoo temporarily deferred on August 19, 2012 by Steve Jenkins (updated 3834 days ago)

Since I was already in an LED mood after upgrading my Maglites, I decided I’d punch up the performance of my M3 Tactical Illuminator with an LED upgrade of its own. The ubiquitous M3 Tactical Illuminator, a favorite among law enforcement and military personnel, is a rail-mounted weapon light produced by […]

Review: Insight/EOTech M3/M6 Tactical Light LED Upgrade Bezel Kit

This entry was posted in Guns Product Reviews and tagged bezel bulb EOTech Insight kit LED LED upgrade M3 M6 tactical illuminator tactical light Upgrade on August 8, 2012 by Steve Jenkins (updated 4487 days ago)

I love my Maglites. I’ve owned a number of them in different sizes since I was a Boy Scout. And while their rugged construction, reliability, ease of use, and excellent customer service never go out of style, bulb technology has changed dramatically since the years when I was collecting merit […]

Review: TerraLUX Maglite LED Replacement Bulb Upgrade

This entry was posted in Guns Product Reviews and tagged conversion kit LED MAG-LITE Maglite TerraLUX Upgrade on August 8, 2012 by Steve Jenkins (updated 4487 days ago)