Email payload is broken when set CURLOPT_CRLF = 1

[vuonganh1993]

I did this

My program sends emails by curl with CURLOPT_CRLF = 1. Everything worked fine with 7.76.0. Recently, we upgraded to curl 8.8.0 and the email is always broken if the payload is greater than 64Kb. I found out that the payload is missing some data.

To fix the issue, I need to set CURLOPT_CRLF = 0 and add "\r\n" to the end of every line in the payload. it works fine again.

I expected the following

No response

curl/libcurl version

curl 8.8.0

operating system

Windows Enterprise 11

[bagder]

please tell us a way how we can reproduce this!

[vuonganh1993]

Hi @bagder ,
Attach the sample code and the sample email file.
For testing, I place the email file at "C:\test_email.txt", and then read the content as the input stream.

test_email.txt
send_email_code.txt

[icing]

I can verify that there is a bug with input larger than 64kb.

[vuonganh1993]

Thank @icing

[icing]

I propose #14169 as fix for this, including a modified test case to trigger the bug.

If you can build curl yourself it would be nice if you could verify this. (There is a Windows nightly build out there, I think, but could not find a link. Someone can help out here?)

[vszakats]

Daily Windows builds can be found here, scroll down to Artifacts:
https://github.com/curl/curl-for-win/actions/workflows/daily.yml

(don't mind the red, it affects mac runners and pushed a(nother) fix just today.)