[pfx] Re: I keep getting disabled on [email protected] mailing list

On 17/06/2026 8:49 am, Matus UHLAR - fantomas via Postfix-users wrote:
> On 14.06.26 19:06, Al via Postfix-users wrote:
>> I have taken a look at my logs:
>> 
>> This is the error:
>> 
>> Jun  9 12:03:41 sequoia postfix/smtpd[52759]: NOQUEUE: reject: RCPT 
>> from unknown[45.90.5.195]: 554 5.7.1 Client host rejected: cannot find 
>> your reverse hostname, [45.90.5.195]; 
>> from=<[email protected]> to=<[email protected]> 
>> proto=ESMTP helo=<list.sys4.de>
> 
> Doesn't your ISP mess with DNS, e.g. intercept it?

I don't know. How would I test this?

>> I added:
>> 
>> [email protected]       OK
>> 
>> to sender_checks and this seems to have resolved this issue.
> 
> I'd advise to add IP 45.90.5.195 to client_checks instead.

I just added this.

> ...at least according to your previous mail at:
> 
> https://marc.info/?l=postfix-users&m=178097029875686&w=2
> 
> since seems you missed something in your paste below...
> 
>> smtpd_helo_required = yes
>>    cidr:/usr/local/etc/postfix/client_checks, check_sender_access
>>    hash:/usr/local/etc/postfix/sender_checks, check_sender_access
>>    hash:/usr/local/etc/postfix/sender_access,

# postconf -nf | more
alias_database = hash:/usr/local/etc/postfix/aliases
alias_maps = hash:/usr/local/etc/postfix/aliases
canonical_maps = hash:/usr/local/etc/postfix/canonical.sender
command_directory = /usr/local/sbin
compatibility_level = 3.7
daemon_directory = /usr/local/libexec/postfix
data_directory = /var/db/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd
     $daemon_directory/$process_name $process_id & sleep 5
disable_vrfy_command = yes
html_directory = /usr/local/share/doc/postfix
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailbox_size_limit = 0
mailq_path = /usr/local/bin/mailq
manpage_directory = /usr/local/man
meta_directory = /usr/local/libexec/postfix
mydestination = localhost
mydomain = teisprint.com
myhostname = sequoia.teisprint.com
mynetworks = 127.0.0.0/8, 10.10.2.0/24
mynetworks_style = host
myorigin = $myhostname
newaliases_path = /usr/local/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/local/share/doc/postfix
sample_directory = /usr/local/etc/postfix
sender_canonical_maps = hash:/usr/local/etc/postfix/canonical.sender
sendmail_path = /usr/local/sbin/sendmail
setgid_group = maildrop
shlib_directory = /usr/local/lib/postfix
smtp_tls_CApath = /etc/ssl/certs
smtpd_hard_error_limit = 5
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_mynetworks, check_client_access
     cidr:/usr/local/etc/postfix/client_checks, check_sender_access
     hash:/usr/local/etc/postfix/sender_checks, check_sender_access
     hash:/usr/local/etc/postfix/sender_access, 
reject_unknown_sender_domain,
     reject_unknown_reverse_client_hostname, 
reject_invalid_helo_hostname,
     reject_non_fqdn_helo_hostname, reject_non_fqdn_hostname,
     reject_non_fqdn_sender, reject_non_fqdn_recipient,
     reject_unknown_helo_hostname, 
reject_unknown_reverse_client_hostname,
     reject_unauth_pipelining, reject_invalid_hostname,
     reject_unauth_destination, reject_unknown_sender_domain,
     reject_unknown_recipient_domain, reject_rbl_client zen.spamhaus.org,
     reject_rbl_client b.barracudacentral.org, reject_rbl_client 
bl.spamcop.net,
     reject_rbl_client noptr.spamrats.com, reject_rbl_client 
psbl.surriel.com,
     reject_rbl_client dnsbl.sorbs.net, reject_rbl_client
     bl.spameatingmonkey.net, permit
strict_rfc821_envelopes = yes
unknown_client_reject_code = 554
unknown_local_recipient_reject_code = 550
virtual_alias_maps = 
mysql:/usr/local/etc/postfix/mysql-virtual-alias-maps.cf,
     mysql:/usr/local/etc/postfix/mysql-virtual-email2email.cf
virtual_gid_maps = static:2000
virtual_mailbox_base = /var/vmail
virtual_mailbox_domains =
     mysql:/usr/local/etc/postfix/mysql-virtual-mailbox-domains.cf
virtual_mailbox_maps =
     mysql:/usr/local/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_minimum_uid = 500
virtual_transport = virtualprocmail:dummy
virtual_uid_maps = static:2000
virtualprocmail_destination_recipient_limit = 1

Please let me know what else I need to change.

Kind Regards,
Al

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