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Qpsmtpd is an open-source software package that provides a high-performance, extensible, secure, and configurable SMTP server. It is designed to be a fast, robust, extensible, and reliable mail server for small to medium-sized businesses and organizations. It is written in Perl and its feature-set includes configurable SMTP extensions, access control, anti-spam/virus filtering, logging and reporting, SSL/TLS support, DKIM signing, DKIM verification, rate limiting, and more.
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