Some downloads are truncated and can't be opened or saved.
The two most recent versions of Thunderbird I've used, now 52.1.0, 52.0.1 before, have problems downloading some attachments. Seen with some, but not all PDF attachments. 27 bytes only downloaded when either opened or saved. Other PDF attachments work fine. The problem attachments are completely functional if I use a different MUA to open the e-mail off of the same IMAP server.
الحل المُختار
See Bug 1361278. It looks like this has been solved for a forthcoming version.
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Is this for an account which is not synchronized for offline use? If so, you may be seeing this bug. See comment 30 for a workaround.
If that's not the case, you may need to set mail.imap.fetch_by_chunks to false.
sfhowes said
Is this for an account which is not synchronized for offline use? If so, you may be seeing this bug. See comment 30 for a workaround.
This may be related, though much of the behavior described in that problem doesn't quite match up with what I was seeing. For example, the problem files were all saved as only 27 bytes long on disk.
I am synchronizing from an IMAP server. However I was limiting downloads to 100 KB. I've now increased that to 10,000 KB and attachments that were failing are now working. I will note, however, that before I made the change to settings, some PDF attachments well in excess of 100 KB in size were working fine already.
Bottom line: synchronizing more mail to local disk makes the problem get better. I consider this a workaround, not solution.
Thanks.
الحل المُختار
See Bug 1361278. It looks like this has been solved for a forthcoming version.