Thunderbird loses and damages pdf attachments.

[Jim_R]

I have had an email from my pension provider. It should have had three pdfs attached. It had only two and one of those was damaged. I went direct to my email provider website and was able to get them from there. But Thunderbird only downloaded two of them, and one of those it corrupted. This is not the first time it has happened.

Jim

[alsdkfhadflkhsd]

I had the same problem when downloading emails with attachments from yahoo imap using thunderbird.

For now I have found the workaround of disabling mail.server.default.fetch_by_chunks in Tools => Settings => (scroll to the end of the screen) => click on "Config Editor" (on the bottom right side)

I found this workaround here:

• http://forums.mozillazine.org/viewtopic.php?f=39&t=2434829&sid=e7e800af6239c985bc91aad4afa6d777&star...
• http://forums.mozillazine.org/viewtopic.php?f=39&t=858335&start=0&st=0&sk=t&sd=a
• https://www.servwise.com/en/knowledgebase/987/Problems-with-Thunderbird-and-IMAP.html

But I don't know if this setting has any side effect.

[CB151]

I tried the fix and no luck.  Actually, if I open the attachment immediately, it is there but after 2 minutes not good any more!  Very frustrating.  I may have to ditch Thunderbird and just work with Outlook.

[HFAlex72]

Me too. Win11 and TB115.6.1 64bit.
Using my mobile to download attachments as a temporary workaround.
Hoping in an easy fix soon...

[GrahamLovell]

My Thunderbird is up to date (Windows version  TB 115.10.1 (64-bit))

PDFs cannot be opened in TB and also when downloaded to my computer cannot be opened.

They can be opened in  MAC Thunderbird (on a different machine).

[Erwan]

Hello
My manager has reported this problem to me several times (PDF cut off or totally corrupted).
However, he does NOT use Thunderbird but Outlook and indeed, the attachments are in good condition in the original mail provider.
I deduce that the problem is due to the quality of the network: when there is a cut or irregularity at the time of transfer, the attachments are corrupted.
We recently switched to fiber optics, and since then we've had no new cases.

[SergioB]

I started having the same problem more recently , with the Nebula version of Thunderbird. Randomly Pdf attachment are corrupted in Thunderbird, on my Outlook.com account. The same emails received on the same PC with the Outlook App of Windows are not having any problem , similarly the same emails received on the smartphone do not have the problem. Once forwarding the email to myself from the Outlook App of the PC to Thunderbird on the same PC, the attachment is then correctly received by Thunderbird. The network is the same, used by Thunderbird, by the Outlook App and by the smartphone. I derive that the problem is somewhere in Thunderbird