[Solved] Postfix: Client host rejected: cannot find your hostname

TheGoliath · 2018-08-22 08:00:51

Greetz everyone,
I'm currently messing around with my mail-setup here.
Everything is working properly except receiving mails (which should obv. work).
I'm running the setup in a systemd-nspawn container.
the postfix/main.cf:

##
## Network settings
##

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
inet_interfaces = 127.0.0.1, ::1, 10.1.0.3
myhostname = mail.mydomain.de

##
## Mail queue settings
##

maximal_queue_lifetime = 1h
bounce_queue_lifetime = 1h
maximal_backoff_time = 15m
minimal_backoff_time = 5m
queue_run_delay = 5m


##
## TLS settings
###

tls_preempt_cipherlist = yes
tls_ssl_options = NO_COMPRESSION
tls_high_cipherlist = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA


### Outbound SMTP connections (Postfix as sender)

smtp_tls_security_level = dane
smtp_dns_support_level = dnssec
smtp_tls_policy_maps = mysql:/etc/postfix/sql/tls-policy.cf
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_ciphers = high
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

### Inbound SMTP connections

smtpd_tls_security_level = may
smtpd_tls_protocols = !SSLv2, !SSLv3
smtpd_tls_ciphers = high
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache

smtpd_tls_cert_file=/etc/letsencrypt/live/mydomain.de/fullchain.pem
smtpd_tls_key_file=/etc/letsencrypt/live/mydomain.de/privkey.pem


##
## Local mail delivery to Dovecot via LMTP
##

virtual_transport = lmtp:unix:private/dovecot-lmtp

##
## Spam filter and DKIM signatures via Rspamd
##

smtpd_milters = inet:localhost:11332
non_smtpd_milters = inet:localhost:11332
milter_protocol = 6
milter_mail_macros =  i {mail_addr} {client_addr} {client_name} {auth_authen}
milter_default_action = accept



##
## Server Restrictions for clients, cecipients and relaying
## (concerning S2S-connections. Mailclient-connections are configured in submission-section in master.cf)
##

### Conditions in which Postfix works as a relay. (for mail user clients)
smtpd_relay_restrictions =      reject_non_fqdn_recipient
                                reject_unknown_recipient_domain
                                permit_mynetworks
                                reject_unauth_destination


### Conditions in which Postfix accepts e-mails as recipient (additional to relay conditions)
### check_recipient_access checks if an account is "sendonly"
smtpd_recipient_restrictions = check_recipient_access mysql:/etc/postfix/sql/recipient-access.cf


### Restrictions for all sending foreign servers ("SMTP clients")
smtpd_client_restrictions =     permit_mynetworks
                                check_client_access hash:/etc/postfix/without_ptr
                                reject_unknown_client_hostname


### Foreign mail servers must present a valid "HELO"
smtpd_helo_required = yes
smtpd_helo_restrictions =   permit_mynetworks
                            reject_invalid_helo_hostname
                            reject_non_fqdn_helo_hostname
                            reject_unknown_helo_hostname

# Block clients, which start sending too early
smtpd_data_restrictions = reject_unauth_pipelining


##
## Restrictions for MUAs (Mail user agents)
##

mua_relay_restrictions = reject_non_fqdn_recipient,reject_unknown_recipient_domain,permit_mynetworks,permit_sasl_authenticated,reject
mua_sender_restrictions = permit_mynetworks,reject_non_fqdn_sender,reject_sender_login_mismatch,permit_sasl_authenticated,reject
mua_client_restrictions = permit_mynetworks,permit_sasl_authenticated,reject


##
## Postscreen Filter
##

### Postscreen Whitelist / Blocklist
postscreen_access_list =        permit_mynetworks
                                cidr:/etc/postfix/postscreen_access
postscreen_blacklist_action = drop


# Drop connections if other server is sending too quickly
postscreen_greet_action = drop


### DNS blocklists
postscreen_dnsbl_threshold = 2
postscreen_dnsbl_sites =    ix.dnsbl.manitu.net*2
                            zen.spamhaus.org*2
postscreen_dnsbl_action = drop


##
## MySQL queries
##

virtual_alias_maps = mysql:/etc/postfix/sql/aliases.cf
virtual_mailbox_maps = mysql:/etc/postfix/sql/accounts.cf
virtual_mailbox_domains = mysql:/etc/postfix/sql/domains.cf
local_recipient_maps = $virtual_mailbox_maps


##
## Miscellaneous
##

### Maximum mailbox size (0=unlimited - is already limited by Dovecot quota)
mailbox_size_limit = 0

### Maximum size of inbound e-mails (50 MB)
message_size_limit = 52428800

### Do not notify system users on new e-mail
biff = no

### Users always have to provide full e-mail addresses
append_dot_mydomain = no

### Delimiter for "Address Tagging"
recipient_delimiter = +

postfix/master.cf

# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
smtp      inet  n       -       y       -       1       postscreen
    -o smtpd_sasl_auth_enable=no
smtpd     pass  -       -       y       -       -       smtpd
dnsblog   unix  -       -       y       -       0       dnsblog
tlsproxy  unix  -       -       y       -       0       tlsproxy
submission inet n       -       y       -       -       smtpd
    -o syslog_name=postfix/submission
    -o smtpd_tls_security_level=encrypt
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_sasl_type=dovecot
    -o smtpd_sasl_path=private/auth
    -o smtpd_sasl_security_options=noanonymous
    -o smtpd_client_restrictions=$mua_client_restrictions
    -o smtpd_sender_restrictions=$mua_sender_restrictions
    -o smtpd_relay_restrictions=$mua_relay_restrictions
    -o milter_macro_daemon_name=ORIGINATING
    -o smtpd_sender_login_maps=mysql:/etc/postfix/sql/sender-login-maps.cf
    -o smtpd_helo_required=no
    -o smtpd_helo_restrictions=
    -o cleanup_service_name=submission-header-cleanup
pickup    unix  n       -       y       60      1       pickup
cleanup   unix  n       -       y       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
tlsmgr    unix  -       -       y       1000?   1       tlsmgr
rewrite   unix  -       -       y       -       -       trivial-rewrite
bounce    unix  -       -       y       -       0       bounce
defer     unix  -       -       y       -       0       bounce
trace     unix  -       -       y       -       0       bounce
verify    unix  -       -       y       -       1       verify
flush     unix  n       -       y       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       y       -       -       smtp
relay     unix  -       -       y       -       -       smtp
showq     unix  n       -       y       -       -       showq
error     unix  -       -       y       -       -       error
retry     unix  -       -       y       -       -       error
discard   unix  -       -       y       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       y       -       -       lmtp
anvil     unix  -       -       y       -       1       anvil
scache    unix  -       -       y       -       1       scache
submission-header-cleanup unix n - n    -       0       cleanup
    -o header_checks=regexp:/etc/postfix/submission_header_cleanup

sudo systemctl status postfix

● postfix.service - Postfix Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)
   Active: active (running) since Wed 2018-08-22 09:51:34 CEST; 5min ago
  Process: 16166 ExecStop=/usr/bin/postfix stop (code=exited, status=0/SUCCESS)
  Process: 16177 ExecStart=/usr/bin/postfix start (code=exited, status=0/SUCCESS)
 Main PID: 16251 (master)
   CGroup: /system.slice/postfix.service
           ├─16251 /usr/lib/postfix/bin/master -w
           ├─16252 pickup -l -t unix -u -c
           ├─16253 qmgr -l -t unix -u
           └─16257 tlsmgr -l -t unix -u -c

Aug 22 09:51:56 mail postfix/smtpd[16262]: NOQUEUE: reject: RCPT from unknown[212.227.17.22]: 450 4.7.25 Client host rejected: cannot find your hostname, [212.227.17.22]; from=<felix.golatofski@gmx.de> to=<goliath@mydomain.de> proto=ESMTP helo=<mout.gmx.net>
Aug 22 09:51:56 mail postfix/smtpd[16262]: disconnect from unknown[212.227.17.22] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=5/7
Aug 22 09:53:15 mail postfix/postscreen[16259]: CONNECT from [212.227.17.21]:57165 to [10.1.0.3]:25
Aug 22 09:53:15 mail postfix/postscreen[16259]: PASS OLD [212.227.17.21]:57165
Aug 22 09:53:15 mail postfix/smtpd[16262]: connect from unknown[212.227.17.21]
Aug 22 09:53:15 mail postfix/smtpd[16262]: NOQUEUE: reject: RCPT from unknown[212.227.17.21]: 450 4.7.25 Client host rejected: cannot find your hostname, [212.227.17.21]; from=<myemail@gmx.de> to=<goliath@mydomain.de> proto=ESMTP helo=<mout.gmx.net>
Aug 22 09:53:16 mail postfix/smtpd[16262]: disconnect from unknown[212.227.17.21] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=5/7
Aug 22 09:56:36 mail postfix/anvil[16263]: statistics: max connection rate 1/60s for (smtpd:212.227.17.22) at Aug 22 09:51:55
Aug 22 09:56:36 mail postfix/anvil[16263]: statistics: max connection count 1 for (smtpd:212.227.17.22) at Aug 22 09:51:55
Aug 22 09:56:36 mail postfix/anvil[16263]: statistics: max cache size 1 at Aug 22 09:51:55
[root@mail ~]#

Especially take a look at

Aug 22 09:53:15 mail postfix/smtpd[16262]: NOQUEUE: reject: RCPT from unknown[212.227.17.21]: 450 4.7.25 Client host rejected: cannot find your hostname, [212.227.17.21]; from=<myemail@gmx.de> to=<goliath@mydomain.de> proto=ESMTP helo=<mout.gmx.net>
Aug 22 09:53:16 mail postfix/smtpd[16262]: disconnect from unknown[212.227.17.21] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=5/7

(I did indeed copy /etc/{localtime,resolv.conf,hosts,services} to /var/spool/postfix/etc)

If any further information is needed, feel free to ask.

Cheers,
Felix aka TheGoliath

Last edited by TheGoliath (2018-08-23 18:36:29)

loqs · 2018-08-22 09:01:00

http://www.postfix.org/postconf.5.html# … t_hostname

TheGoliath · 2018-08-22 09:04:57

Yes, I've seen that already. But the provider gmx should match it's ip addresses via a ptr record correctly. So I think it is some misconfiguration or missing configuration with my postfix.

loqs · 2018-08-22 09:20:37

If you remove that option is the mail accepted? You did not indicate you were aware of that option being the likely cause in the original post so I suggested it.

TheGoliath · 2018-08-22 13:54:38

Yes, the mail goes through. Yes, sorry. I should have indicated that. I know, that it's the cause. I just want to know, how to get it working with the option (cause it looks for the server's ptr records or hostnames and thus it prohibits a lot of spam for me). So the problem should be the DNS, right? My resolv.conf sets two nameservers. My own nameserver in the IPv6 and IPv4 format. I already tried the same with both resolvers of cloudflare (1.1.1.1, 1.0.0.1,....)

(Just to show, that it worked: https://imgur.com/a/RqbKygO)

loqs · 2018-08-22 15:20:15

Perhaps it is the following you connect from 212.227.17.21 with helo mout.gmx.net dig@1.1.1.1 shows that has the address 5.79.121.69 dig -x @1.1.1.1 shows no reverse for that IP.
Edit:
If this is meant to be you as an authenticated user sending mail I can not see anything in the log snippet you posted of the client authenticating itself and postfix is treating it as another mail server.

Last edited by loqs (2018-08-22 15:30:23)

TheGoliath · 2018-08-23 06:26:41

212.227.17.21 should be the gmx's ip which (normally) has an reverse dns

brebs · 2018-08-23 09:14:58

TheGoliath wrote:

My resolv.conf sets two nameservers. My own nameserver in the IPv6 and IPv4 format.

It sounds like your nameserver is not providing your postfix server with the result of:

unbound-host 212.227.17.21
21.17.227.212.in-addr.arpa domain name pointer mout.gmx.net.

Last edited by brebs (2018-08-23 09:15:21)

TheGoliath · 2018-08-23 10:20:32

unbound works properly:
[root@mail ~]# unbound-host 212.227.17.21
21.17.227.212.in-addr.arpa domain name pointer mout.gmx.net.

So idk why postfix can't `access` the unbound

brebs · 2018-08-23 10:29:46

Does /etc/resolv.conf contain "nameserver 127.0.0.1", to actually *use* unbound?

TheGoliath · 2018-08-23 10:41:43

Yes it does. Both files `/etc/resolv.conf` and `/var/spool/postfix/etc/resolv.conf` contain `nameserver 127.0.0.1`
Tried it recently again.

Aug 23 12:40:20 mail postfix/postscreen[25305]: CONNECT from [212.227.17.20]:40123 to [10.1.0.3]:25
Aug 23 12:40:26 mail postfix/postscreen[25305]: PASS OLD [212.227.17.20]:40123
Aug 23 12:40:26 mail postfix/smtpd[25308]: connect from unknown[212.227.17.20]
Aug 23 12:40:26 mail postfix/smtpd[25308]: NOQUEUE: reject: RCPT from unknown[212.227.17.20]: 450 4.7.25 Client host rejected: cannot find your hostname, [212.227.17.20]; from=<myemail@gmx.de> to=<goliath@mydomain.de> proto=ESMTP helo=<mout.gmx.net>
Aug 23 12:40:26 mail postfix/smtpd[25308]: disconnect from unknown[212.227.17.20] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=5/7
Aug 23 12:43:46 mail postfix/anvil[25288]: statistics: max connection rate 1/60s for (submission:79.129.28.135) at Aug 23 12:39:21
Aug 23 12:43:46 mail postfix/anvil[25288]: statistics: max connection count 1 for (submission:79.129.28.135) at Aug 23 12:39:21
Aug 23 12:43:46 mail postfix/anvil[25288]: statistics: max cache size 1 at Aug 23 12:39:21
Aug 23 12:45:29 mail postfix/postscreen[25350]: CONNECT from [212.227.17.21]:43411 to [10.1.0.3]:25
Aug 23 12:45:29 mail postfix/postscreen[25350]: PASS OLD [212.227.17.21]:43411
Aug 23 12:45:29 mail postfix/smtpd[25353]: connect from unknown[212.227.17.21]
Aug 23 12:45:29 mail postfix/smtpd[25353]: NOQUEUE: reject: RCPT from unknown[212.227.17.21]: 450 4.7.25 Client host rejected: cannot find your hostname, [212.227.17.21]; from=<myemail@gmx.de> to=<goliath@mydomain.de> proto=ESMTP helo=<mout.gmx.net>
Aug 23 12:45:29 mail postfix/smtpd[25353]: disconnect from unknown[212.227.17.21] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=5/7

Last edited by TheGoliath (2018-08-23 10:50:22)

sincomil · 2018-08-23 10:53:10

TheGoliath
Can you check output of

$ dig -x 8.8.4.4 
$ dig -x 212.227.17.21

To make sure system resolver using your local DNS recursor

TheGoliath · 2018-08-23 12:12:05

Works imo:

[root@mail ~]# dig -x 8.8.4.4 

; <<>> DiG 9.13.2 <<>> -x 8.8.4.4
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 19721
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;4.4.8.8.in-addr.arpa.          IN      PTR

;; ANSWER SECTION:
4.4.8.8.in-addr.arpa.   86400   IN      PTR     google-public-dns-b.google.com.

;; Query time: 977 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Aug 23 14:11:20 CEST 2018
;; MSG SIZE  rcvd: 93

[root@mail ~]# dig -x 8.8.4.4 

; <<>> DiG 9.13.2 <<>> -x 8.8.4.4
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 51464
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;4.4.8.8.in-addr.arpa.          IN      PTR

;; ANSWER SECTION:
4.4.8.8.in-addr.arpa.   86390   IN      PTR     google-public-dns-b.google.com.

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Aug 23 14:11:30 CEST 2018
;; MSG SIZE  rcvd: 93

Last edited by TheGoliath (2018-08-23 12:12:52)

TheGoliath · 2018-08-23 12:24:36

Anything else I could/should try?

loqs · 2018-08-23 12:56:47

@TheGoliath is it expected that the connection is being treated as a SMTP client rather than a Mail user agent?

TheGoliath · 2018-08-23 13:05:30

No why should it be treated as an smtp client?

TheGoliath · 2018-08-23 13:06:50

For further reference. My setup is based on the Blogpost: https://thomas-leister.de/en/mailserver-debian-stretch/

sincomil · 2018-08-23 13:14:23

You have following line on your master.cf:

-o smtpd_client_restrictions=$mua_client_restrictions

And at the same time you have

mua_client_restrictions = permit_mynetworks,permit_sasl_authenticated,reject

on main.cf
so every smtp client your postfix get connected will be checked with mua_client_restrictions and smtpd_client_restrictions will not be checked for them. As a result only authenticated clients and permit_mynetworks hosts are allowed to send an emails

Last edited by sincomil (2018-08-23 13:15:33)

loqs · 2018-08-23 13:16:02

In post #5 you indicated that removing reject_unknown_client_hostname resolved the issue. In the configuration you posted in #1

### Restrictions for all sending foreign servers ("SMTP clients")
smtpd_client_restrictions =     permit_mynetworks
                                check_client_access hash:/etc/postfix/without_ptr
                                reject_unknown_client_hostname

Is the only use of reject_unknown_client_hostname.

TheGoliath · 2018-08-23 13:18:57

Aww yeah. Makes sense. Gonna fix that when I'm back from the beach

loqs · 2018-08-23 17:13:02

@simcomil do you have a corrected config or example config that requires authentication for MUA's to send mail and no authentication but additional checks for other mail servers?

TheGoliath · 2018-08-23 17:47:22

One thing. Look at my master.cf all processes are running in a chroot. Thus could it be that they can't reach the local resolver?

TheGoliath · 2018-08-23 18:08:49

And I rewrote the whole mail setup. So I didn't copy&paste but edited every config file accordingly. Should be now more maintainable.
(So using e.g. /etc/dovecot/conf.d/* and stock files (modified to fit my needs))

I was right with the chroot. Now it works when disabling chroot.
@loqs @sincomil

TheGoliath · 2018-08-23 18:09:24

So resolving the hostname and thus the option with reject_unknown_client

Journal:

Aug 23 20:07:41 mail postfix/smtpd[981]: connect from mout.gmx.net[212.227.17.21]
Aug 23 20:07:41 mail postfix/smtpd[981]: A418312856: client=mout.gmx.net[212.227.17.21]
Aug 23 20:07:41 mail postfix/cleanup[989]: A418312856: message-id=<51473227-f8cc-e5f4-8427-38f49d8d67c2@gmx.de>
Aug 23 20:07:41 mail postfix/qmgr[954]: A418312856: from=<myemail@gmx.de>, size=2085, nrcpt=1 (queue active)
Aug 23 20:07:42 mail postfix/smtpd[981]: disconnect from mout.gmx.net[212.227.17.21] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
Aug 23 20:07:42 mail postfix/lmtp[991]: A418312856: to=<goliath@mydomain.de>, relay=mail.mydomain.de[private/dovecot-lmtp], delay=0.35, delays=0.32/0/0/0.03, dsn=2.0.0, status=sent (250 2.0.0 <goliath@mydomain.de> ULGbOu33flvgAwAAYrfSig Saved)
Aug 23 20:07:42 mail postfix/qmgr[954]: A418312856: removed

For your information. I found that entry in the arch wiki:
https://wiki.archlinux.org/index.php/Po … hroot_jail
It even tells me that I should copy the libraries.
I should rtfm!

Thanks guys. You are great people.

/Solved

Last edited by TheGoliath (2018-08-23 18:23:04)

TheGoliath · 2018-08-23 18:24:14

One last question. How can I mark this thread as solved?
Or is it only possible when being a moderator =<

Arch Linux

#1 2018-08-22 08:00:51

[Solved] Postfix: Client host rejected: cannot find your hostname

#2 2018-08-22 09:01:00

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#3 2018-08-22 09:04:57

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#4 2018-08-22 09:20:37

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#5 2018-08-22 13:54:38

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#6 2018-08-22 15:20:15

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#7 2018-08-23 06:26:41

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#8 2018-08-23 09:14:58

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#9 2018-08-23 10:20:32

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#10 2018-08-23 10:29:46

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#11 2018-08-23 10:41:43

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#12 2018-08-23 10:53:10

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#13 2018-08-23 12:12:05

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#14 2018-08-23 12:24:36

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#15 2018-08-23 12:56:47

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#16 2018-08-23 13:05:30

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#17 2018-08-23 13:06:50

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#18 2018-08-23 13:14:23

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#19 2018-08-23 13:16:02

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#20 2018-08-23 13:18:57

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#21 2018-08-23 17:13:02

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#22 2018-08-23 17:47:22

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#23 2018-08-23 18:08:49

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#24 2018-08-23 18:09:24

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

#25 2018-08-23 18:24:14

Re: [Solved] Postfix: Client host rejected: cannot find your hostname

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