I found an additional detail, which might be of interest:
Sending (instead of receiving) email with the same GMX account does not
suffer from that SSL problem.
Here is my account preferences in claws-mail, and the log file:
* SMTP AUTH with algorithm LOGIN
* Use SSL encryption for SMTP
* SMTP port: 465
------ BEGIN claws-mail network log file ----------
* Connecting to SMTP server: mail.gmx.net ...
[17:49:44] SMTP< 220 mail.gmx.net GMX Mailservices ESMTP {mp025}
[17:49:44] ESMTP> EHLO <nameofmymachine>
[17:49:44] ESMTP< 250-mail.gmx.net GMX Mailservices
[17:49:44] ESMTP< 250-8BITMIME
[17:49:44] ESMTP< 250-ENHANCEDSTATUSCODES
[17:49:44] ESMTP< 250-SIZE
[17:49:44] ESMTP< 250-AUTH=LOGIN PLAIN
[17:49:44] ESMTP< 250-AUTH LOGIN PLAIN
[17:49:44] ESMTP< 250 STARTTLS
[17:49:44] ESMTP> AUTH LOGIN
[17:49:44] ESMTP< 334 VXN......WU6
[17:49:44] ESMTP> [USERID]
[17:49:44] ESMTP< 334 UGF......mQ6
[17:49:44] ESMTP> [PASSWORD]
[17:49:44] ESMTP< 235 2.7.0 Go ahead {mp025}
[17:49:44] ESMTP> MAIL FROM:<myemailaddress> SIZE=351
[17:49:44] SMTP< 250 2.1.0 ok {mp025}
[17:49:44] SMTP> RCPT TO:<myotheremailaddress>
[17:49:44] SMTP< 250 2.1.5 ok {mp025}
[17:49:44] SMTP> DATA
[17:49:44] SMTP< 354 mail.gmx.net Go ahead {mp025}
[17:49:44] SMTP> . (EOM)
[17:49:45] SMTP< 250 2.6.0 Message accepted {mp025}
* Mail sent successfully.
[17:49:45] SMTP> QUIT
[17:49:45] SMTP< 221 2.0.0 GMX Mailservices {mp025}
------ END claws-mail network log file ----------
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