My question is quite simple, but I was unable to find anything: I need a program like this https://www.servolutions.de/popcon.htm
This program is for Exchange Server.
Instead of receiving emails directly via SMTP (you’d need a fixed IP always-on Internet connection for that), POPcon will download your POP3 and IMAP email periodically and then forward it to your Exchange Server.
I need something similar for Open-Xchange
Sincerely
Benedikt