I've got a new installation of Mailman 3 setup, however I am having some
issues I'm not sure how to troubleshoot.

Mailman is successfully sending invite emails however user messages sent to
the list are not being sent to subscribers. Also in Hyperkitty none of my
test messages to the list are showing up in the archive.

I am using Postfix with an SMTP relay hosted at Brevo.com (formally
sendinblue). Brevo's logs show the message getting rejected


Log from brevo.com (SMPT Relay)
Sent on 17-11-2024 21:49:16
>From listmem...@gmail.com
To listmem...@gmail.com
Message ID<CAPesOD1y0fEaG=GFodz=Lgs1m_hqRErPnQcpXCNtKsBbJ=
b...@mail.gmail.com>

17-11-2024 21:49:16
Sending has been rejected because the sender you used listmem...@gmail.com
is not valid. Validate your sender or authenticate your domain


>>>Postfix main.cf

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
# fresh installs.
compatibility_level = 3.6



# TLS parameters
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level=may

smtp_tls_CApath=/etc/ssl/certs
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache


smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated
defer_unauth_destination
myhostname = list.louisvillecommunitygrocery.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = $myhostname
mydestination = $myhostname, list.louisvillecommunitygrocery.com,
localhost.louisvillecommunitygrocery.com, , localhost
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all

# Mailman3 configs
# Support the default VERP delimiter.
recipient_delimiter = +

unknown_local_recipient_reject_code = 550
owner_request_special = no

transport_maps =
    hash:/opt/mailman/mm/var/data/postfix_lmtp
local_recipient_maps =
    hash:/opt/mailman/mm/var/data/postfix_lmtp
relay_domains =
    hash:/opt/mailman/mm/var/data/postfix_domains

#SMPT Relay Brevo
relayhost = [smtp-relay.sendinblue.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_tls_security_level = encrypt
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt


*In closing*, can anyone point me in the right direction for further
troubleshooting on this issue?


Thank you,
Paul 'Arte Chambers' Robey
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