The Postfix http map type allows you to hook up Postfix to a server with HTTP protocol, such as apache lighttpd nginx, etc. You need to write a CGI with C CPP Perl PHP etc, to complete the HTTP protocol to your database proprietary protocol conversion.
An advanced qmail distribution based on qmail-sql which has SMTP, SMTPS, POP3, POP3S, IMAP, IMAPS services, a content scanner, spoofing protections, SMTP AUTH support, SMTP-after-POP/IMAP, PHP5 API, SPF support and much more...
vSQLmail is a software who make link between MySQL and vpopmail. It's very useful if you don't have mysql support in your vpopmail, and a good alternative of vpopmail's API for PHP. You can use it easily in PHP
Quick Mail Project is Mail Server with Web mail. The project is independed platform support designed Using Java ,C, PHP ,MySQL database . Its support RFC SMTP protocol , RFC Internet Message, Multi domains, forward, block, spam bulk and a lot more.
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This is a set of programs that allows you to create your own WebMail with sendmail & procmail & imapd & webmail with dynamic sql users and mailbox limitations. You can control your users through web, view statistic, and other.