[Pkg-mailman-hackers] Bug#1070407: (no subject)

[b+bugs.debian.org at abelo.ch]

Upon the upgrade from debian bookworm to debian trixie I got the same
error.

I hint in this conversation helped me out:
https://groups.google.com/g/linux.debian.bugs.dist/c/QC1jyq6evvQ

Delete the line

# EMAILNAME = 'localhost'

from /etc/mailman3/mailman-web.py before upgrading.
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