April 2012

PowerMTA is no doubt great MTA but it requires lots of configuration to make it work intelligently. If your pmta license have Out bound connections limit than you have to configure it smartly, to free up connections and increase emails per minute/hour.

Most of the time, these connections are used by invalid domains e.g hotmaail.com, yahooo.com, gmail.cm and on other hand your bounce-after for global domains is too long e.g bounce-after 4d 12hr (by default)

How PowerMTA works?

PowerMTA tries to resolve Domain to IP (If it fails, it doesn’t make tcp connection, through DnsQueryFailed error), then it tries to make tcp connection and wait for SMTP greeting. (It keeps trying until smtp-greeting-timeout value (default 5m) reaches.After5 minutes, connection is killed and this process is repeated until bounce-after (in your global domain configuration) is reached.

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PowerMTA is industry top class Mail Transfer Agent that is used by myspace.com, top email service providers including ISPs. PMTA has very advance configuration that helps you to manage millions of email per day.

There are hundreds of feature which can’t be cover here. Below are few features copied from port25.com

PowerMTA Features

  • Number of simultaneous connections
  • Number of messages per connection
  • Number of delivery attempts per hour (throttling)
  • Retry period and bounce period

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Apache 2.4.1 is the latest stable version available on Apache.org download section. Since it is the latest version so it may have plenty of dependencies issues. In my case, i am installing it from source(httpd-2.4.1.tar.bz2).

Currently i am logged in using SSH on Plain CentOS 6.2 server and it has very basic packages installed.

Downloading and compiling Apache 2.4.1

cd /usr/local/src/
wget http://apache.mirrors.pair.com//httpd/httpd-2.4.1.tar.bz2
tar -jxf httpd-2.4.1.tar.bz2
cd httpd-2.4.1
./configure --prefix=/usr/local/apache --enable-so --enable-deflate --enable-expires --enable-headers --enable-rewrite

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