PowerMTA™ is the market's leading email gateway software that makes it easy for senders to adopt the latest authentication specifications (SenderID, SPF, Domain Keys and DKIM) and comply with policies for accountable outbound email delivery. No false promises. No over hype. It just delivers.

Since 1999, Port25 Solutions, Inc. has been fighting spam from the send side, by helping email service providers and top brands address the challenges of legitimate email marketing and customer communications.

Each and every day, hundreds of millions of legitimate email messages are sent through PowerMTA -- messages from brand names and Fortune 500 companies you know and trust. Leading email service providers, top financial institutions, major publishers, well-known consumer brands and interactive social networks all use PowerMTA because they know they can trust its reliability and efficiency .

The first MTA solution certified and approved by Goodmail Systems, PowerMTA includes support for Goodmail CertifiedEmail on Windows operating systems and support for 64-bit Linux systems. more...