[Xymon] Bug in Mailman version 2.1.29: We're sorry, we hit a bug!

[Bruno Manzoni]

Hi Henrik, JC,

I did try to confirm that thers is a problem or not with the mailing 
list: So I try to subscribe to the mailing list and I receive this message:
------------------------

Bug in Mailman version 2.1.29
We're sorry, we hit a bug!
Please inform the webmaster for this site of this problem. Printing of 
traceback and other system information has been explicitly inhibited, 
but the webmaster can find this information in the Mailman error logs or 
the web server logs.

------------------------

*This seems to confirm that, people are currently unable to subscribe*
And maybe also as Liang, Ye-Fee wrote: "and now find myself *unable to 
email to the mailing list*" (29.9.2023)
Norbert wrote "*It is not possible to sign up for the Xymon user group 
anymore *(we are long time users and can comment, but no new users are 
allowed). If someone can take over this mail service this would be more 
important then code updates imho, to show that the project is still 
alive. (14.8.2023)

I am pretty sure this is not normal and would propose you my help (if 
you need it) to resolve this problem

Let me know what I can do.
I will also contact mailman3.com  a make you a summary.

Bruno
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