PMTA is advance SMTP server software to send million mails per day.
Below are many features of powermta.

VirtualMTA Technology - VirtualMTA Technology allows
sender to control the source IP address for each single message. Each
VirtualMTA performs its delivery functions independently; therefore, as long as
the source IP is not blacklisted, your message has a higher chance of being
routed to the inbox.
Delivery Policy Management - PowerMTA enables you to set your configurations globally, per
recipient domain, per campaign, per client, per “VirtualMTA”, etc. to assist
meet ISP standards including:
- Number of simultaneous connections
- Number of messages per connection
- Number of delivery attempts per hour (throttling)
- Retry period and bounce period
- Authentication method
In addition, PowerMTA provides support in these areas:
- Ability to break connections of lower priority queues
- New IP address warm-up feature to help build reputation
- Ability to pause queues and delete or re-start
Power Queue - The heart of PowerMTA:
performance and scalability:
- Delivers 10x more messages per hour than leading freeware alternatives and corporate mail systems
- Strict compliance with Internet email protocols
- Includes both outbound and inbound message processing
Reputation Monitoring - Built-in functionality lets you stay on top of your reputation and be
proactive about fixing problems:
- Real-time reputation monitoring
- Immediate notification of perceived blocks
- Ability to implement new delivery policy for perceived blocks
Integration &
Personalization - Integration with your CRM is
easy with PMTA:
- Standard submission interface using SMTP
- File-based submission using pickup directory
- Proprietary submission interface through our API (C, C++, Java, Perl, .NET)
- Data exports from delivery log (XML, CSV, HTML, etc.)
- API to delivery log (C, Java, Perl)
- Forwarding of inbound messages to file or via local pipe
Configuration & Control - PowerMTA is easy to install
and configure. Most users have it up and running in just a few minutes.
- Installation follows the common approaches used on each of the major platforms.
- Text-file configuration tool comes pre-populated with common settings
- Extensive control options allow you to tailor PowerMTA to your specific needs.
- A command-line management tool is provided.
Authentication/Accreditation Tools - PowerMTA has built-in support
for:
- Domain Keys and DKIM (including multiple DKIM signatures)
- SenderID and SPF
- “Guaranteed Authentic” mode
- DMARC