Good Day, I did a further analysis of the problem mentioned before.
While analysing the source of Courier POP3D I found that it does not recognize new messages in new/ but when I moved the message manually to cur/ the retrieval was working. The rename() call does not work. In fact, the NTFS file system does not allow the ":" character, used as MDIRSEP. I recompiled pop3d and it worked like a charm. SqWebMail does not implement MDIRESP but has fixed strings of ':' within the code. The constant is available in all source files so the conversion should be relative simple. I worked a few hours on the source but due to my limited C++ knowledge I was not able to convert all occurences to MDIRSEP and it got unstable. Can someone with more knowledge of the internal structures make a small patch to make the seperator character changeable? That would help me a lot! Thank you very much! Best Regards, Markus