Thanks, but no luck. Trying option 1, added custom_header.py file:
from mailman.interfaces.handler import IHandler
from zope.interface import implementer
@implementer(IHandler)
class AddCustomHeader:
def process(self, mlist, message, msgdata):
"""Add a custom email header."""
message['X-Custom-Header-1'] = 'ABCD'
logger.info('Custom header added to message for list: %s',
mlist.fqdn_listname)
to /opt/mailman/venv/lib/python3.9/site-packages/mailman/handlers/
and modified
/opt/mailman/venv/lib/python3.9/site-packages/mailman/pipelines/builtin.py:
class PostingPipeline(BasePipeline):
"""The built-in posting pipeline."""
name = 'default-posting-pipeline'
description = _('The built-in posting pipeline.')
_default_handlers = (
'validate-authenticity',
'mime-delete',
'tagger',
'member-recipients',
'avoid-duplicates',
'cleanse',
'cleanse-dkim',
'cook-headers',
'subject-prefix',
'rfc-2369',
'to-archive',
'to-digest',
'to-usenet',
'after-delivery',
'acknowledge',
# All decoration is now done in delivery.
# 'decorate',
'dmarc',
# Message decoration in delivery can break an arc signature, so sign
# in delivery after decorating.
# 'arc-sign',
'custom_header',
'to-outgoing',
)
Upon service restart got KeyError: 'custom_header':
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 1077, in
main
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: with
self.make_context(prog_name, args, **extra) as ctx:
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 943, in
make_context
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: self.parse_args(ctx,
args)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 1644, in
parse_args
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: rest =
super().parse_args(ctx, args)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 1408, in
parse_args
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: value, args =
param.handle_parse_result(ctx, opts, args)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 2400, in
handle_parse_result
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: value =
self.process_value(ctx, value)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/click/core.py", line 2362, in
process_value
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: value =
self.callback(ctx, self, value)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/bin/mailman.py", line
95, in initialize_config
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: initialize(value)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/core/initialize.py",
line 229, in initialize
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]:
initialize_2(propagate_logs=propagate_logs)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/core/initialize.py",
line 198, in initialize_2
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]:
initialize_pipelines()
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/core/pipelines.py",
line 75, in initialize
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]:
add_components('pipelines', IPipeline, config.pipelines)
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/utilities/modules.py",
line 219, in add_components
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: component =
component_class()
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: File
"/opt/mailman/venv/lib64/python3.9/site-packages/mailman/pipelines/base.py",
line 38, in __init__
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]:
self._handlers.append(config.handlers[handler_name])
Oct 17 15:42:22 news.ivolatility.com mailman[1986181]: KeyError: 'custom_header'
Oct 17 15:42:22 news.ivolatility.com systemd[1]: mailman3.service: Control
process exited, code=exited, status=1/FAILURE
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