Pop-before-SMTP - first authenticate Yourself via POP3 and then relay your mails
Pop-before-SMTP reads data from FIFO file (POP3-daemon writes to this FIFO) and adds RELAY hosts into access file. Next rebuilds database allowing IPs relay mails. Everything goes in real time allowing Your clients to send mails immediately after receiving post via POP3.
The program is written under GNU GPL Public License.
Email bug reports to firstname.lastname@example.org. Be sure to include the word "pop-before-smtp" somewhere in the "Subject:" field.