Archive for July, 2013

How to limit the number of recipients in Postfix

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1) If you wish to limit the total number of recipients in an email, you can do that using the variable:

# postconf -e 'smtpd_recipient_limit=10'
# /etc/init.d/postfix restart

2) If you wish to specifically limit the number if recipients in TO and CC. You can do that with the option in

header_checks = regexp:/etc/postfix/header_checks

contents of /etc/postfix/header_checks

/^To:([^@]*@){50,}/ REJECT Sorry, your message has too many recepients.
/^Cc:([^@]*@){50,}/ REJECT Sorry, your message has too many recepients.

This will not work for BCC. By the time the message gets to header_checks, the BCC header will be already removed.

Protect Your Facebook Account With Login Approvals

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What is Facebook’s Two-Factor Authentication?

Facebook’s two-factor authentication (a.k.a Login Approvals) is an added security feature used to help prevent hackers from logging into your account with a stolen password. It helps you prove to Facebook that you are who you say you are. This is done by Facebook determining that you are connecting from a previously unknown device or browser and issuing you an authentication challenge, requiring you to enter a numeric code that generated by using the Code Generator tool from within your smartphone’s Facebook app.

Once you have entered the code you received on your phone, Facebook will allow the login to take place. Hackers (whom hopefully don’t have your smartphone) will not be able to authenticate since they won’t have access to the code (unless they have your phone)


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DuckDuckGo released its mobile application

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Flash C++ compiler is now open source

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If you like Flash, here is a good news that should interest you. Adobe released its open source Flash C + + compiler.

FlashCC, this compiler can import and use of C or C + + code to the web while maintaining good performance, cross-browser compatibility, connecting with the Flash API, and support for graphics acceleration .

FlasCC is now available on Github as brick CrossBridge project.

There were no major changes from the previous version and it apart from the passage in open source will allow to everybody to make forks or integrate the compiler code in their own projects.

Demo of Epic Games using Flash C++ Compiler is here Unreal Engine 3.

For more information it is here.