[MM3-users] Mass subscribe operation fails with http error

Hi,

We have a mailing list where the admin has configured a custom template: [list:user:action:invite] When inviting a user using Mass Subscribe, the operation fails with the error: HTTP Error 400: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))

I have reviewed similar threads, including: https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/M...

I have updated the config in: /etc/mailman3/settings.py to contain: POSTORIUS_TEMPLATE_BASE_URL = 'https://mailinglists.ucl.ac.uk'

After adding that item, I've recreated the template and resubmitted the subscribe. But still get the same error.

What could I try next?

Regards, Brian Senior Systems Administrator, UCL ISD