To allow member of mailing list (or mail alias) account to send email as this mailing list (or mail alias), please follw steps below:
reject_sender_login_mismatch
in Postfix config file /etc/postfix/main.cf
.reject_sender_login_mismatch
in iRedAPD config file
/opt/iredapd/settings.py
./opt/iredapd/settings.py
to allow member to send email
as mail list or mail alias:ALLOWED_LOGIN_MISMATCH_LIST_MEMBER = True