Hi Janos,
yes. Please start ngrep and let's see what happens on the network, eg. ngrep -X -e port 143 and host my.mail.host
I have pasted the (I think) relevant lines here: http://paste.ubuntu.com/1509869/To me, the last line "BYE IMAP Server not available.." is a bit sudden and unexpected...?
Also please check if your maillog has any helpful entries.
I don't see anything interesting there... Hopefully the logs we do have tell you something..? MJ
