Issue of sharing pdf files from WPS

[Junnan Zhang]

Hello everyone, my phone is Samsung S6 Edge, Android 5.0.2, rooted. I find that K-9 mail cannot correctly send pdf files shared from WPS. It seems all right when composing, but the pdf attachments cannot be opened (maybe impaired I think) in the inbox. I tried other email clients (like bluemail) with no problem. So I believe it is related to K-9. Does anybody know the reason?

[Richard]

What is "WPS" in this context? It may be something obvious, but not
to me.

When you are having trouble viewing the pdfs (after sending from
K-9), are you trying to view then with K-9 or some other email
client, if so what?

[Junnan Zhang]

I'm sorry for not making it clear. WPS is a pdf/word viewer app, which can be 

downloaded from Play Store. 

I tried to view those pdfs in "sent" folder and succeeded. But in the inbox of 

the email I sent to, they cannot be opened correctly. However, if I add attachments 

in K-9 directly from file explorer, there is no problem. So I think it is a issue related 

to sharing pdfs from WPS to K-9. 

[Richard]

I'm going to suspect that WPS doesn't do the multi-part headers
quite right when trying to attach the pdf to a K-9 message. You
could look at the raw version of messages where you attach using WPS
vs. FileExplorer vs the "sent" mail. My bet, given that "sent" is
ok, is that there's a problem with the "Content-Transfer-Encoding"
part with WPS as that matters when the message goes out through a
mail server while not as much for on-device "sent" mail.


> Date: Saturday, August 29, 2015 10:47:46 -0700
> From: Junnan Zhang <zhangju...@gmail.com>
>

> I'm sorry for not making it clear. WPS is a pdf/word viewer app,
> which can be downloaded from Play Store.
>
> I tried to view those pdfs in "sent" folder and succeeded. But in
> the inbox of the email I sent to, they cannot be opened
> correctly. However, if I add attachments in K-9 directly from
> file explorer, there is no problem. So I think it is a issue
> related to sharing pdfs from WPS to K-9.
>
> On Thursday, August 27, 2015 at 1:53:47 AM UTC+8, Richard wrote:
>>
>>
>> > Date: Wednesday, August 26, 2015 03:14:12 -0700

>> > From: Junnan Zhang <zhangju...@gmail.com <javascript:>>

>> >
>> > Hello everyone, my phone is Samsung S6 Edge, Android 5.0.2,
>> > rooted. I find that K-9 mail cannot correctly send pdf files
>> > shared from WPS. It seems all right when composing, but the
>> > pdf attachments cannot be opened (maybe impaired I think) in
>> > the inbox. I tried other email clients (like bluemail) with
>> > no problem. So I believe it is related to K-9. Does anybody
>> > know the reason?
>>
>> What is "WPS" in this context? It may be something obvious, but
>> not to me.
>>
>> When you are having trouble viewing the pdfs (after sending from
>> K-9), are you trying to view then with K-9 or some other email
>> client, if so what?
>>

------------ End Original Message ------------

[Junnan Zhang]

Yes! You are right! I checked the sources of two test emails I sent, one with 

attachment shared from WPS and one from File Explorer. I found that in the 

"attachment parts" of the sources, their Content-Transfer-Encoding are different!

The Content-Transfer-Encoding of the correctly sent attachment is base64, and 

the other one is 8bit, which is the same as the Content-Transfer-Encoding of

the "message parts" of the emails. 

Is that the reason why the pdfs cannot be correctly sent? So it's WPS's fault?

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[Richard]

Yes, the 8bit Content-Transfer-Encoding is the problem. Sending a
pdf between non-like systems that way will end up with a corrupted
document, e.g., in the handling of cr/lf. It would seem that this is
WPS's error/fault.


> Date: Tuesday, September 01, 2015 12:48:52 +0800
> From: Junnan Zhang <zhangju...@gmail.com>

>
> Yes! You are right! I checked the sources of two test emails I
> sent, one with attachment shared from WPS and one from File
> Explorer. I found that in the "attachment parts" of the sources,
> their Content-Transfer-Encoding are different!
>
> The Content-Transfer-Encoding of the correctly sent attachment is
> base64, and the other one is 8bit, which is the same as the
> Content-Transfer-Encoding of the "message parts" of the emails.
>
> Is that the reason why the pdfs cannot be correctly sent? So it's
> WPS's fault?
>

[Junnan Zhang]

Thank you very much! I'm gonna report this issue to WPS.