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I only wanted to give to the standard Nagios email template, the Bold and Italic formatting.
Then I saw this.
Less than 2 minutes to setup everything and worked at first try!
Great job ;)

Only things I want to note:
1. I use Nagios to read the log of lots of scripts of mine, I use performance data here because I can have more details BUT for these group of services I do not process them (process_perfdata 0).
I find it useful to have them in the email, so I added:
"$SERVICEPERFDATA$"
at the end of notify-service-by-email.

Modified the php:
$extra_info= array_shift($argv); /*19*/
and added this row just below "Additional info":
$body .= "Extra Info:$extra_info\r\n";

2. I changed shebang to #!/usr/bin/env php not really a reason here, if not that I do not have /etc/php.ini but
/etc/php5/apache2/php.ini
/etc/php5/cli/php.ini

What's important is that it works very very well!