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Re: [Regression since 8.18.0] SMTP GSSAPI authentication in curl_sasl skipped with --negotiate -u

From: Alexandr Timofeev via curl-library <curl-library_at_lists.haxx.se>
Date: Mon, 6 Jul 2026 16:44:57 +0300

> Can you check if https://github.com/curl/curl/pull/22044 solves your problem?

Sorry for the delay in reply, and thanks for the fix.

I have checked, and the problem seems to be fixed with curl 8.21.0-rc3.

For the history, curl.exe (8.21.0-rc3) outputs the following:
  < 250-AUTH GSSAPI NTLM
  ...
> AUTH GSSAPI
  < 334 GSSAPI supported
  ...
  < 235 2.7.0 Authentication successful
> MAIL FROM:<test_at_acme.com> SIZE=164
  ...

This output is consistent with 8.16.0, which didn't have the regression.

Thanks,
Alexandr Timofeev
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Received on 2026-07-06