i have successfully set up mailman3 instance by following the guide at https://gitlab.com/mailman/mailman-suite-doc/blob/master/source/install/virt... and from this mailing list. my setup uses an alias domain i.e the mail server is different from the lists server. I have successfully created an alias domain and mailing list through Postorius but I keep getting this error in syslog. OSError: [Errno 99] error while attempting to bind on address ('xxx.xx.xx.xx', 8024): cannot assign requested address. Even when I change the port number, I still get the same error Kindly assist.

here is my mailman.cfg config [paths.here] var_dir: /opt/mailman/mm/var

[mailman] layout: here site_owner: postmaster@mail.example.com

[database] class: mailman.database.postgresql.PostgreSQLDatabase url: postgres://mailman:#passwd@localhost/mailman

[archiver.prototype] enable: yes

# For the HyperKitty archiver. [archiver.hyperkitty] class: mailman_hyperkitty.Archiver enable: yes configuration: /opt/mailman/mm/mailman-hyperkitty.cfg

[shell] history_file: $var_dir/history.py

[mta] verp_confirmations: yes verp_personalized_deliveries: yes verp_delivery_interval: 1 incoming: mailman.mta.postfix.LMTP outgoing: mailman.mta.deliver.deliver lmtp_host: mail.example.com lmtp_port: 8024 smtp_host: mail.example.com smtp_port: 25 configuration: python:mailman.config.postfix recipient_delimiter = + unknown_local_recipient_reject_code = 550 owner_request_special = no

POSTFIX_STYLE_VIRTUAL_DOMAINS= ['example.com']

/etc/mailman3/settings.py file is as follows from mailman_web.settings.base import * from mailman_web.settings.mailman import * ADMINS = ( ('Mailman Suite Admin', 'root@localhost'), ) DATABASES = { 'default': { 'ENGINE': 'django.db.backends.postgresql_psycopg2', 'NAME': 'mailmanweb', 'USER': 'mailman', # TODO: Replace this with the password. 'PASSWORD': 'passwd', 'HOST': 'localhost', 'PORT': '5432', } } STATIC_ROOT = '/opt/mailman/web/static' LOGGING['handlers']['file']['filename'] = '/opt/mailman/web/logs/mailmanweb.log' ALLOWED_HOSTS = [ 'localhost', 'lists.example.com', 'mail.example.com', # Archiving API from Mailman, keep it. ] SITE_ID = 1 SECRET_KEY = 'key MAILMAN_ARCHIVER_KEY = 'key DEFAULT_FROM_EMAIL = 'postmaster@example.com' SERVER_EMAIL = 'postmaster@example.com' HAYSTACK_CONNECTIONS = { 'default': { 'ENGINE': 'haystack.backends.whoosh_backend.WhooshEngine', 'PATH': os.path.join(BASE_DIR, "fulltext_index"), }, }

/etc/postfix/main.cf is as follows smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no compatibility_level = 2 smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydomain = example.com myhostname = lists.example.com mydestination = $myhostname, localhost.$mydomain, localhost relayhost = mail.example.com myorigin = $mydomain mynetworks = 127.0.0.0/8, 10.0.0.0, 192.0.0.1, [::ffff:127.0.0.0]/104 [::1]/128 mynetworks_style = subnet mailbox_size_limit = 4096000000 #message_size_limit = 2048000000 recipient_delimiter = + inet_interfaces = all #inet_protocols = all inet_protocols = ipv4 unknown_local_recipient_reject_code = 550 owner_request_special = no virtual_mailbox_domains = example.com virtual_mailbox_base = /var/vmail virtual_uid_maps = static:20000 virtual_gid_maps = static:20000 transport_maps = hash:/opt/mailman/mm/var/data/postfix_lmtp local_recipient_maps = proxy:unix:passwd.byname $alias_maps hash:/opt/mailman/mm/var/data/postfix_lmtp relay_domains = hash:/opt/mailman/mm/var/data/postfix_domains virtual_alias_maps = hash:/opt/mailman/mm/var/data/postfix_vmap

postfix domains as follows: lists.example.com example.com

postfix lmtp as follows: testlist@lists.example.com lmtp:[mail.example.com]:8024 testlist-bounces@lists.example.com lmtp:[mail.example.com]:8024 testlist-confirm@lists.example.com lmtp:[mail.example.com]:8024

postfix vmap as follows: testlist@example.com nmutest@lists.example.com testlist-bounces@example.com nmutest-bounces@lists.example.com testlist-confirm@example.com nmutest-confirm@lists.example.com