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On Fri, 25 Jun 2010, Frank Bonnet wrote:

Some users had occasionally a problem with Thunderbird , some random emails with attachement(s) cannot be read anymore

Yep.

the email appears empty

that one, too

and TB seems to enter in an infinite loop
saying it is downloading the message

that one in two cases:

1) after I hit the memory limit in Dovecot causing it to crash and Thunderbird happily continues forever to wait for a response.

2) thunderbird opened too many simultaneous connections to the server. I do not remember where they would blocked or terminated, but in some cases thunderbird did not seem to detect this failure

After doing that all emails re-appear normally and attachements
are readable/downloadable again.

In my case the local cache was broken, so any action to rebuilt it was helpful:

+ delete the local mbox-cache file
+ hit the "Reindex" button of the folder properties of newer versions of Thunderbird

Regards,

- -- Steffen Kaiser
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