From SnickityBit: A powerful e-mail rules engine that will allow printing, saving, replies on previous or incoming e-mail. Extensible so that others may add functionality by writing their own plug-in for use with application. With the FTP plug-in, the server turns into a full featured FTP server that allows peer-less FTP transfers with the E-mail File Transfer Protocol Client using e-mail. All files are encrypted for security, transport e-mails are deleted as they are processed to save space on mail server. The user may decide the size of each transport e-mail to accommodate their e-mail server. No ports to configure, if the server and the client both have e-mail access, then you may transfer files.
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