1733315 - Forwarding inline one specific message with PDF attachment, the attachment is missing in the received message

Status: RESOLVED INCOMPLETE

(MailNews Core :: Networking: SMTP, defect)

Description

[Victor Diuk]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Safari/605.1.15

Steps to reproduce:

The size of the attachment (PDF file) is not determined in the received letter.

1. I forward the letter with an attachment to another address;
2. A letter comes to another address without this attachment (!).

Thunderbird 91.1.2 versions have been tested for both Windows and macOS. If the original letter is forwarded in a different way (by other mail client like Roundcube), then the size is determined correctly and the attachment appears in the forwarded letter.

Actual results:

The forwarded email does not contain the original attachment.

Expected results:

The forwarded email must contain the original attachment.

Comment 1

[Ping Chen [:rnons] (away)]

Can you reproduce it with any attachment files or a specific pdf file?

When forwarding, can you try File -> Send Later, then go to the Outbox folder, see if the message contains attachment.

Comment 2

[Victor Diuk]

This reproduces with this specific PDF file. If there is another ones, not known.

Comment 3

[Ping Chen [:rnons] (away)]

Is it possible to share this pdf file so I can try to reproduce? Can you download a nightly version from https://ftp.mozilla.org/pub/thunderbird/nightly/latest-comm-central/thunderbird-94.0a1.en-US.win64.zip, and see if it's the same.

Comment 4

[Victor Diuk]

Unfortunately, I cannot transfer the PDF itself, since its contents constitute a trade secret of the company. And I'll try the beta version.

Comment 5

[Thomas D. (:thomas8)]

Hi Victor, this is unlikely to be a bug in Thunderbird. Maybe something odd about the MIME structure of the message (what you call "letter") which you're forwarding. We need a lot more detail from you for this to go anywhere...

Forwarding a message with attached PDF works for me on TB 91.1.2 (64-bit), Win10. Reported against Mac.
Victor, can you please try the following steps exactly, to inspect the outgoing message in your own outbox?

• with your trouble-PDF
• then with another PDF (from a different source)

STR

1. Right-click on message A with subject "hello world" and attachment-1.pdf
2. From context menu, select Forward As > Inline (!)
3. In composition window of message B (Fwd: hello world), add recipient
4. File -> Send Later (!)
5. Check message B in your own Thunderbird, Local Folders > Outbox
6. Double-click on attachment-1.pdf of Message B in outbox

Actual = Expected

• Outbound message B in outbox contains attachment-1.pdf
• attachment-1.pdf opens and shows up correctly.

---

• After step 2, are you still seeing attachment-1.pdf in composition window? Can you open attachment-1.pdf from there with double-click? (The temporary PDF was renamed to nsmail.tmp in my case, but could be opened as a PDF)-
• After step 6, can you open attachment-1.pdf from message B in your own outbox?
• What makes you think that this has anything to do with determining the size of attachment? Did you inspect the code?
• What happens if in step 4, you CC yourself - does your own received copy of message B still have the attachment-1.pdf?
• Any screenshots that you can make available (use graphic editor to black out sensitive data) and attach here via Attach New File button above comment 0?