PEAR::SOAP includes classes and examples to handle SOAP Messages embedded in Email. These classes are used in relatively the same manor as a regular HTTP based SOAP Server, except that they need to be executed by a task scheduler or directly by the SMTP server itself. This server reads data from STDIN and services the SOAP Message it receives. If you use QMail, you can create a .qmail-soapaddress file with '| /usr/bin/php /path/to/email_server.php' to service SOAP over SMTP requests. addObjectMap($soapclass,'urn:SOAP_Example_Server'); $server->service($email); ?>]]>