I have recently noticed a problem with unrelated mails being concatenated. I can't say for sure exactly when it started but it seems to happen after I have manually archived mails. Opening some mails I've found that they contain the content of multiple unrelated mails. Usually two or three. The mails which are not related to the subject line displayed in the GUI just show as source. Some of them are tagged onto the end of a email so I do not notice the problem immediately. Others appear before the "correct" email. At first I thought it was a problem showing full headers even though the "normal" view was selected but I've found the headers are not related and it is more than the headers in there. So far I've only seen this on my Yahoo IMAP account and there are other, HTML mail display problems with this account but using the Yahoo web interface all the mails in the inbox display correctly. Does anyone have any ideas what might be happening and how to correct it?