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.
[Keep Reading…]
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
[Keep Reading…]
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
[Keep Reading…]
Since i was busy, so couldn’t write about Andreas Koch‘s new app called ‘DroidSheep Guard’ that helps you protect against DroidSheep and FaceNiff android application.
How DroidSheep Guard works?
DroidSheep Guard continuously monitor your ARP table and alerts you when it finds suspicious activity.Droidsheep and faceniff are popular android applications that use ARP spoofing technique to hijack all sessions traveling on Wifi networks. Using DroidSheep Guard you can configure it to check every x minute and once it found malicious activity, it will popup an alert.
[Keep Reading…]
I have talked about ApacheKiller flaw in detail here with possible workaround to mitigate this flaw.
Last week, a DDoS mitigation service vendor Arbor Networks revealed a detailed report can be download from here which say,
[Keep Reading…]
We have talked about SlowHTTPTest in detailed here, 2 days ago Shekyan released a new version, below is summary of change log.
SlowHTTPTest 1.4 release notes:
- Added man pages as doc support
- Some bug fixes
- and now it can handle 64000 concurrent connections
OpsS!!
You can read our previous post in detail that would help you, how to compile and use it.
Download and install SlowHTTPTest latest version :
wget http://slowhttptest.googlecode.com/files/slowhttptest-1.4.tar.gz
tar -zxvf slowhttptest-1.4.tar.gz
[Keep Reading…]
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.
