James Cloos <cloos@jhcloos.com> writes:

Hi James,

> I see that some of the Received headers have continuation lines which
> start with a space rather than a tab.
>
> I wonder whether that is confusing dovecot?
>
> An ngrep, tcpdump or wireshark/tshark dump of the imap port when
> opening the folder containing that mail and when selecting that mail
> in the *Summary* buffer might help debug it.

Puh, I'll try that later, if the debug output doesn't help.

> Also, try setting the nnimap-debug and imap-debug variables.

Attached are the contents of the *imap-debug* and *nnimap-debug* buffers
after entering the group and selecting the message.  When I tried to
save the contents of *imap-debug* to a file, emacs complained about
characters that cannot be saved with my default coding system
(utf-8?!?).

,----
| These default coding systems were tried to encode text
| in the buffer `foo.txt':
|   (utf-8-unix (36999 . 1785198))
| However, each of them encountered characters it couldn't encode:
|   utf-8-unix cannot encode these: [] <-- I deleted it, so that gnus
|                                          doesn't complain while sending.
| 
| Click on a character (or switch to this window by `C-x o'
| and select the characters by RET) to jump to the place it appears,
| where `C-u C-x =' will give information about it.
| 
| Select one of the safe coding systems listed below,
| or cancel the writing with C-g and edit the buffer
|    to remove or modify the problematic characters,
| or specify any other coding system (and risk losing
|    the problematic characters).
| 
|   utf-8-emacs
`----

M-x describe-char on that character says (Again I replaced the offending
char with [] in this mail, so that gnus doesn't complain while
sending.):

,----
|         character: [] (1785198, #o6636556, #x1b3d6e)
| preferred charset: emacs (Full Emacs characters)
|        code point: 0x1B3D6E
|            syntax: w 	which means: word
|       buffer code: #xF6 #xB3 #xB5 #xAE
|         file code: not encodable by coding system utf-8-unix
|           display: no font available
| 
| Character code properties are not shown: customize what to show
| 
| Here is a `help-xref' button labeled `[]'.
| 
| 
| There are text properties here:
|   auto-composed        t
|   button               (t)
|   category             help-xref-button
|   face                 link
|   help-args            ("foo2.txt" 36999)
|   help-echo            "mouse-2, RET: jump to this character"
|   help-function        [Show]
| 
| [back]
`----

I saved the *imap-debug* as imap-debug.txt (raw-text encoding) and
imap-debug2.txt (utf-8-emacs encoding).