Possible problem with TLS and SMTP causing timeout in curl 8.12?

From: Christian Schmitz via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 5 Feb 2025 16:42:16 +0100

Hello,

So I connect with CURL 8.12 and I see this output:


curl -k --ssl -v "smtp://sslout.xxx.eu:25"

...
* Connected to sslout.xxx.eu (xxx) port 25
* server response timeout
* closing connection #0
curl: (28) server response timeout

So we get a timeout as EHLO is not sent.

Doing the same with

curl -k -v "smtps://sslout.df.eu:465"

Shows this:

...
* Connected to sslout.xxx.eu (xxx) port 465
< 220 smtprelay06.xxx.xx ESMTP dfex
> EHLO MyMac
< 250-smtprelay06.xxx.xx Hello MyMacM3 [xxx]

And using the first variant with command line tool using older curl version, I see

* SSL certificate verify ok.
> EHLO MyMac
< 250-smtprelay08.xxx.xx Hello MyMacM3 [xxx]


So for some reason I don't see yet, we don't get to the state when to send EHLO.

Has anyone seen this?


Best regards,
Christian

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Received on 2025-02-05