Ok, the problem seems to be, that a syncing of mbsync created the folders '[Google Mail].Sent Mail' and '[Google Mail].Spam' on the IMAP server.
I'm not quite sure which misconfiguration of mbsync could have done this. After removing these folders from the IMAP server everything works. Thanks! Greetings, Daniel ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ isync-devel mailing list isync-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/isync-devel