When users receive email with attachments in non-english characters and encoding other then UTF-8 and click forward and then
"send", the attachments disappears (the attachment is not send). I've managed to reproduce the error with every email that has attchment like this:
When viewing this attachment name, everything is correct, but when trying to forward that message, on the compose page the name is displayed not correctly and then not send, even the file in data dir is not deleted. Second: When there are more attachments and one of them is non-english and the name is encoded iso-8859-2, when trying delete one attachment from compose page, all attachment disapear and the files in data dir are not deleted. It is not caused by plugins (I tryed to disable all and stil the same problem).
I have tryed on: SquirrelMail 1.4.19 Apache/2.0.61 with PHP 4.4.7 and PHP 5.2.8 and Courier IMAP
Similar problem is described here: http://www.nabble.com/Attachment-with-non-english-characters-disappears-when-forwarding-tt22619381.html#a22619381 and on google you can find some more related to this after the change to UTF-8 I thing versions after 1.4.13 are affected