[Sorry about the personal reply.]
On Sun, Sep 02, 2012 at 05:28:28PM +0300, Timo Sirainen wrote:
On 31.8.2012, at 11.42, Jost Krieger wrote:
One of our users likes to delete attachments from his mails. He is using roundcube and we installed a plugin for that.
Does the plugin change the mbox file directly?
No, it just uses IMAP.
imap(x1234567): Error: Cached message size larger than expected (6796 > 2844)
This looks like it does. Existing emails must not be changed, IMAP protocol forbids it (and Dovecot internals don't support it either). The only safe way to drop attachments is to assign a new UID for the mail, which basically means saving a new message without attachments and deleting the old one. The Content-Length header doesn't really have anything to do with this error.
Sorry if I was unclear. This is exactly what the plugin does. It builds a new message, starting with the old message and leaving out the unwanted attchment(s). Then it saves the new message, deletes the old message and finally copies over the flags.
I had a look at the handling of "Content-Length" in dovecot and had the impression that a new header was added but the old was not removed (if formally ok) and on reading the first header wins. But I'm not sure, of course.
Yours Jost Krieger
| Jost.Krieger+sig@ruhr-uni-bochum.de Please help stamp out spam! | | Postmaster, JAPH, resident answer machine at RUB Comp. Center | | Sincere words are not sweet, sweet words are not sincere. | | Lao Tse, Tao Te King 81 |