On 6/9/25 05:05, Mark Sapiro wrote:
On 6/8/25 16:04, Florian Sukup wrote:
I set up mailman, created a site/domain (lists.yyy.com). My hostname
is host.xxx.com . My IP has a RDNS entry: reverse.rrr.com .
Why is the RDNS to reverse.rrr.com and not host.xxx.com. It is important
for mail delivery to have full circle DNS. I.e. the sending server
should have an A record for its IP and revers DNS for that IP should
point back to the sending server's name. I'm guessing that rrr.com is a
hosting provider and you don't control the rDNS for that IP, but you
should try to get them to change it for you. Without that change,
delivery of your outbound mail, at least to large ISPs, will be
problematic at best.
The setup has historic reasons. However I can eliminate reverse.rrr.com
completely and replace it by host.xxx.com. Right now reverse.rrr.com has
an A-record pointing to the host's ip address.
When I send an email to my mailing list myl...@lists.yyy.com I receive
an error email. The logfile says the following:
...
Jun 9 00:23:38 arvak postfix/relay/smtp[]: 094895FADB:
to=<myl...@lists.yyy.com>, relay=reverse.rrr.com[m.y.i.p]:25,
delay=0.06, delays=0.03/0.01/0.02/0, dsn=5.4.6, status=bounced (mail
for lists.yyy.com loops back to myself)
What is the output from `postconf -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
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
hash:/var/lib/mailman3/data/postfix_lmtp
mailbox_size_limit = 0
message_size_limit = 0
mydestination = localhost, localhost.localdomain, arvak
myhostname = host.xxx.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128, 192.168.77.0/24
myorigin = /etc/mailname
owner_request_special = no
readme_directory = no
recipient_delimiter = +
relay_domains = ${{$compatibility_level} < {2} ? {$mydestination} : {}}
hash:/var/lib/mailman3/data/postfix_domains
relayhost =
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_cert_file = /etc/letsencrypt/live/host.xxx.com/fullchain.pem
smtp_tls_key_file = /etc/letsencrypt/live/host.xxx.com/privkey.pem
smtp_tls_loglevel = 3
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated
defer_unauth_destination
smtpd_tls_cert_file = /etc/letsencrypt/live/host.xxx.com/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/host.xxx.com/privkey.pem
smtpd_tls_loglevel = 3
smtpd_tls_security_level = may
smtpd_use_tls = yes
transport_maps = hash:/var/lib/mailman3/data/postfix_lmtp
virtual_alias_domains = 9 different domains, however not host.xxx.com,
lists.yyy.com or reverse.rrr.com
virtual_alias_maps = hash:/etc/postfix/virtual
Jun 9 00:23:38 arvak postfix/smtpd[114119]: disconnect from
host.xxx.com[m.y.i.p] ehlo=1 quit=1 commands=2
...
The MX record of lists.yyy.com points to reverse.rrr.com. Not sure if
this is the best idea?
reverse.rrr.com has no A or AAAA record. An MX MUST point to a domain
that has an A or AAAA record. The MX should point to host.xxx.com.
Will be resolved (s. above).
Can anyone give me a hint where to search for this error?
The output from `postconf -n` would help. Also, have you set up postfix
per
https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/mta.html#postfix ?
Basically yes, but I see a few differences which all worked on my test
installation. Here comes my mailman.cfg:
[mailman]
site_owner: mailman@...
noreply_address: noreply
default_language: en
sender_headers: from from_ reply-to sender
email_commands_max_lines: 10
pending_request_life: 3d
cache_life: 7d
pre_hook:
post_hook:
layout: debian
filtered_messages_are_preservable: no
html_to_plain_text_command: /usr/bin/lynx -dump $filename
listname_chars: [-_.0-9a-z]
[shell]
prompt: >>>
banner: Welcome to the GNU Mailman shell
use_ipython: no
history_file:
[paths.debian]
var_dir: /var/lib/mailman3
queue_dir: $var_dir/queue
bin_dir: /usr/lib/mailman3/bin
list_data_dir: $var_dir/lists
log_dir: /var/log/mailman3
lock_dir: $var_dir/locks
data_dir: $var_dir/data
cache_dir: $var_dir/cache
etc_dir: /etc/mailman3
ext_dir: $var_dir/ext
messages_dir: $var_dir/messages
archive_dir: $var_dir/archives
template_dir: $var_dir/templates
pid_file: /run/mailman3/master.pid
lock_file: $lock_dir/master.lck
[database]
class: mailman.database.sqlite.SQLiteDatabase
url: sqlite:///$DATA_DIR/mailman.db
debug: no
[logging.debian]
format: %(asctime)s (%(process)d) %(message)s
datefmt: %b %d %H:%M:%S %Y
propagate: no
level: info
path: mailman.log
[webservice]
hostname: localhost
port: 8001
use_https: no
show_tracebacks: yes
api_version: 3.1
admin_user: ...
admin_pass: ...
[mta]
incoming: mailman.mta.postfix.LMTP
outgoing: mailman.mta.deliver.deliver
smtp_host: localhost
smtp_port: 25
smtp_user:
smtp_pass:
lmtp_host: 127.0.0.1
lmtp_port: 8024
configuration: python:mailman.config.postfix
Thanks for your help,
Florian.
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