I attempted to setup VERP on Mailman3 and it doesn't seem to be
changing the sender address. I don't know what the problem is.
I am using the '_' character for my verp delimiter. This is what I
have been using with mailman2 for about 15 years. It has been working
perfectly.
I'm using Postfix 3.10.5.
$ mailman conf | grep verp
[mta] verp_confirm_format: ${address}_${cookie}
[mta] verp_confirm_regexp: ^(.*<)?(?P<addr>[^_]+?)_(?P<cookie>[^@]+)@.*$
[mta] verp_confirmations: yes
[mta] verp_delimiter: _
[mta] verp_delivery_interval: 1
[mta] verp_format: ${bounces}_${local}=${domain}
[mta] verp_personalized_deliveries: yes
[mta] verp_probe_format: ${bounces}_${token}@${domain}
[mta] verp_probe_regexp: ^(?P<bounces>[^_]+?)_(?P<token>[^@]+)@.*$
[mta] verp_probes: yes
[mta] verp_regexp: ^(?P<bounces>[^_]+?)_(?P<local>[^=]+)=(?P<domain>[^@]+)@.*$
$ mailman info
GNU Mailman 3.3.10 (Tom Sawyer)
Python 3.13.5 (main, Jun 25 2025, 18:55:22) [GCC 14.2.0]
config file: /etc/mailman3/mailman.cfg
db url: mysql+pymysql://mm3:blah@localhost/mailman3?charset=utf8&use_unicode=1
devmode: DISABLED
REST root url: https://localhost:8001/3.1/
REST credentials: admin:password
$ cat /etc/debian_version
13.3
What else should I provide that will help?
TIA,
John
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