[sylpheed:36011] Can't connect to NNTP server

[YuGiOhJCJ Mailing-List]

Hello,

On Sylpheed 3.2.0, I can do "right click > Subscribe to newsgroup...".

On some News server (news.eclipse.org and news.proxad.fr), I encounter no problem and the list is displayed.

On some News server (comp.mail.sendmail and comp.mail.mutt), I got this error message:
"Error: can't retrieve newsgroup list".

In the "Tools > Log window" menu, I can read:
"* creating NNTP connection to comp.mail.mutt:119 ...
** LibSylph-WARNING: [14:19:08] Can't connect to NNTP server: comp.mail.mutt:119

** Can't connect to NNTP server: comp.mail.mutt:119"

Do you see how to join these newsgroups on Sylpheed?

Thank you.
Best regards.