PMTA Service - PowerMTA and Open Source Applications

The difference of PowerMTA and Open source applications

Why PowerMTA is better than Open Source Applications?

Some people argue that there are various of open source applications
available in the market today, like exim and Gmail that allow users to
send mass e-mails too. Then why should a person invest in a costly
tool like PowerMTA? If you are also of the same opinion then do have to take
a look at the reasons that justify the claim that PowerMTA is yet still by far
better than Open Source Applications:

•PowerMTA allows you to create a collection of IPS from which you can send mails on a regular basis
•PowerMTA allows the users to send a large number of e-mails at a single point of time
•PowerMTA is very fully equipped to abide by the throttling limits set by different ISP’s
•PMTA has an effective bounce processing mechanism
•PowerMTA also supports implementation of key e-mail authentication methods like DKIM and DK.