The mailing list for listmasters using Sympa

["Christian Stalberg" <address@concealed>]

When I test my email installation with Postfix on Ubuntu 20.04.1 using
telnet port 25, the server answers but then does not respond to entries

root@localhost:/var/log# telnet maillist.naturalintelligence.us 25
Trying 2600:3c00::f03c:92ff:fe7f:c636...
Connected to maillist.naturalintelligence.us.
Escape character is '^]'.
MAIL FROM:address@concealed


Mail.err logfile shows

Aug 26 13:45:32 localhost postfix/cleanup[38538]: fatal: open dictionary:
expecting "type:name" form instead of "(...existing"
Aug 26 13:45:32 localhost postfix/smtpd[38539]: fatal: open dictionary:
expecting "type:name" form instead of "(...existing"
Aug 26 13:46:33 localhost postfix/cleanup[38544]: fatal: open dictionary:
expecting "type:name" form instead of "(...existing"
Aug 26 13:46:33 localhost postfix/smtpd[38545]: fatal: open dictionary:
expecting "type:name" form instead of "(...existing"


below is my postcond -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
compatibility_level = 2
inet_interfaces = all
inet_protocols = all
mailbox_size_limit = 0
mydestination = $myhostname, maillist.naturalintelligence.us, localhost,
localhost.localdomain, localhost
myhostname = localhost.members.linode.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated
defer_unauth_destination
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
transport_maps = (...existing parameter value...),
hash:/etc/sympa/transport.sympa, hash:/etc/sympa/sympa_transport
virtual_alias_maps = (...existing parameter value...),
hash:/etc/sympa/virtual.sympa
virtual_mailbox_domains = (...existing parameter value...),
hash:/etc/sympa/transport.sympa
virtual_mailbox_maps = (...existing parameter value...),
hash:/etc/sympa/transport.sympa, hash:/etc/sympa/sympa_transport,
hash:/etc/sympa/virtual.sympa


please help. Thank you.