Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

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PUREXER
Posts: 4
Joined: 2017/11/07 03:04:34

Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by PUREXER » 2017/11/07 03:37:14

Hi,

I am a newbie in Linux administration specially server side. just to make it clear ;)

I have flowed this tutorial (https://www.howtoforge.com/tutorial/per ... ispconfig/)

everting works fun except went I try to send message via (thunderbird on windows 10) it give this message
SMTP_failed.png
SMTP_failed.png (7.62 KiB) Viewed 2825 times
the postfix, dovecot & amavis are configured by ISPConfig.

I've googl'it the problem and try it many configuration but nothing changed.
if you need any further informations, just ask

Sorry for my bad English
and thanks in advance
-={( :!: )}=-
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tunk
Posts: 1206
Joined: 2017/02/22 15:08:17

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by tunk » 2017/11/07 12:14:58

You may want to check your firewall, both server and client.
Also, I think the general advice is not to disable selinux.
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PUREXER
Posts: 4
Joined: 2017/11/07 03:04:34

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by PUREXER » 2017/11/07 13:07:44

Thanks for your quick reply.

I have check the firewall & iptables that was the first think that come to my mind.
and I've even disabled the firewall to check but nothing come.

Code: Select all

# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ens3
  sources:
  services: ssh dhcpv6-client dns http https pop3 pop3s imap imaps smtp smtps ftp
  ports: 53/tcp 53/udp 80/tcp 443/tcp 110/tcp 995/tcp 143/tcp 993/tcp 21/tcp 25/tcp 587/tcp 465/tcp 8080/tcp
  protocols:
  masquerade: no
  forward-ports:
  source-ports:
  icmp-blocks:
  rich rules:

Code: Select all

# sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere
INPUT_direct  all  --  anywhere             anywhere
INPUT_ZONES_SOURCE  all  --  anywhere             anywhere
INPUT_ZONES  all  --  anywhere             anywhere
DROP       all  --  anywhere             anywhere             ctstate INVALID
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             ctstate RELATED,ESTABLISHED
ACCEPT     all  --  anywhere             anywhere
FORWARD_direct  all  --  anywhere             anywhere
FORWARD_IN_ZONES_SOURCE  all  --  anywhere             anywhere
FORWARD_IN_ZONES  all  --  anywhere             anywhere
FORWARD_OUT_ZONES_SOURCE  all  --  anywhere             anywhere
FORWARD_OUT_ZONES  all  --  anywhere             anywhere
DROP       all  --  anywhere             anywhere             ctstate INVALID
REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
OUTPUT_direct  all  --  anywhere             anywhere

Chain FORWARD_IN_ZONES (1 references)
target     prot opt source               destination
FWDI_public  all  --  anywhere             anywhere            [goto]
FWDI_public  all  --  anywhere             anywhere            [goto]

Chain FORWARD_IN_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain FORWARD_OUT_ZONES (1 references)
target     prot opt source               destination
FWDO_public  all  --  anywhere             anywhere            [goto]
FWDO_public  all  --  anywhere             anywhere            [goto]

Chain FORWARD_OUT_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain FORWARD_direct (1 references)
target     prot opt source               destination

Chain FWDI_public (2 references)
target     prot opt source               destination
FWDI_public_log  all  --  anywhere             anywhere
FWDI_public_deny  all  --  anywhere             anywhere
FWDI_public_allow  all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere

Chain FWDI_public_allow (1 references)
target     prot opt source               destination

Chain FWDI_public_deny (1 references)
target     prot opt source               destination

Chain FWDI_public_log (1 references)
target     prot opt source               destination

Chain FWDO_public (2 references)
target     prot opt source               destination
FWDO_public_log  all  --  anywhere             anywhere
FWDO_public_deny  all  --  anywhere             anywhere
FWDO_public_allow  all  --  anywhere             anywhere

Chain FWDO_public_allow (1 references)
target     prot opt source               destination

Chain FWDO_public_deny (1 references)
target     prot opt source               destination

Chain FWDO_public_log (1 references)
target     prot opt source               destination

Chain INPUT_ZONES (1 references)
target     prot opt source               destination
IN_public  all  --  anywhere             anywhere            [goto]
IN_public  all  --  anywhere             anywhere            [goto]

Chain INPUT_ZONES_SOURCE (1 references)
target     prot opt source               destination

Chain INPUT_direct (1 references)
target     prot opt source               destination

Chain IN_public (2 references)
target     prot opt source               destination
IN_public_log  all  --  anywhere             anywhere
IN_public_deny  all  --  anywhere             anywhere
IN_public_allow  all  --  anywhere             anywhere
ACCEPT     icmp --  anywhere             anywhere

Chain IN_public_allow (1 references)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ssh ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain ctstate NEW
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3 ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3s ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imap ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imaps ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:urd ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftp ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain ctstate NEW
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3 ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3s ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imap ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:imaps ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftp ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:submission ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:urd ctstate NEW
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:webcache ctstate NEW

Chain IN_public_deny (1 references)
target     prot opt source               destination

Chain IN_public_log (1 references)
target     prot opt source               destination

Chain OUTPUT_direct (1 references)
target     prot opt source               destination

Code: Select all

# netstat -tap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 localhost:10027         0.0.0.0:*               LISTEN      9414/master
tcp        0      0 0.0.0.0:pop3            0.0.0.0:*               LISTEN      9301/dovecot
tcp        0      0 0.0.0.0:imap            0.0.0.0:*               LISTEN      9301/dovecot
tcp        0      0 localhost:783           0.0.0.0:*               LISTEN      1118/spamd.pid -d -
tcp        0      0 0.0.0.0:sunrpc          0.0.0.0:*               LISTEN      1/systemd
tcp        0      0 s1.mydom.net:domain   0.0.0.0:*               LISTEN      1081/named
tcp        0      0 localhost:domain        0.0.0.0:*               LISTEN      1081/named
tcp        0      0 0.0.0.0:ftp             0.0.0.0:*               LISTEN      1064/pure-ftpd (SER
tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN      2396/sshd
tcp        0      0 0.0.0.0:smtp            0.0.0.0:*               LISTEN      1580/smtpd
tcp        0      0 localhost:rndc          0.0.0.0:*               LISTEN      1081/named
tcp        0      0 0.0.0.0:imaps           0.0.0.0:*               LISTEN      9301/dovecot
tcp        0      0 0.0.0.0:pop3s           0.0.0.0:*               LISTEN      9301/dovecot
tcp        0      0 localhost:10024         0.0.0.0:*               LISTEN      1373/amavisd (maste
tcp        0      0 localhost:cslistener    0.0.0.0:*               LISTEN      1011/php-fpm: maste
tcp        0      0 localhost:10025         0.0.0.0:*               LISTEN      9414/master
tcp        0      0 0.0.0.0:mysql           0.0.0.0:*               LISTEN      1342/mysqld
tcp        0      0 s1.mydom.net:ssh      xx.xxx.xx:dashpas-port ESTABLISHED 1593/sshd: unknown
tcp        0     64 s1.mydom.net:ssh      xx.xxx.xxx.xxx:65170   ESTABLISHED 32700/sshd: root@pt
tcp        0      0 s1.mydom.net:ssh      xx.xxx.xxx.xxx:37015   TIME_WAIT   -
tcp        0      0 s1.mydom.net:ssh      xx.xxx.xxx.xxx:60787   TIME_WAIT   -
tcp        0      0 s1.mydom.net:ssh      xx.xxx.xx.xx:20221      ESTABLISHED 1594/sshd: root [pr
tcp        0      1 s1.mydom.net:ssh      xx.xxx.xxx.xxx:23812   FIN_WAIT1   -
tcp6       0      0 [::]:pop3               [::]:*                  LISTEN      9301/dovecot
tcp6       0      0 [::]:imap               [::]:*                  LISTEN      9301/dovecot
tcp6       0      0 localhost:783           [::]:*                  LISTEN      1118/spamd.pid -d -
tcp6       0      0 [::]:sunrpc             [::]:*                  LISTEN      1/systemd
tcp6       0      0 [::]:webcache           [::]:*                  LISTEN      571/httpd
tcp6       0      0 [::]:http               [::]:*                  LISTEN      571/httpd
tcp6       0      0 [::]:tproxy             [::]:*                  LISTEN      571/httpd
tcp6       0      0 [::]:ftp                [::]:*                  LISTEN      1064/pure-ftpd (SER
tcp6       0      0 [::]:ssh                [::]:*                  LISTEN      2396/sshd
tcp6       0      0 [::]:smtp               [::]:*                  LISTEN      1580/smtpd
tcp6       0      0 localhost:rndc          [::]:*                  LISTEN      1081/named
tcp6       0      0 [::]:https              [::]:*                  LISTEN      571/httpd
tcp6       0      0 [::]:imaps              [::]:*                  LISTEN      9301/dovecot
tcp6       0      0 [::]:pop3s              [::]:*                  LISTEN      9301/dovecot
tcp6       0      0 localhost:10024         [::]:*                  LISTEN      1373/amavisd (maste
tcp6       0      0 localhost:37994         localhost:imap          TIME_WAIT   -
tcp6       0      0 localhost:http          localhost:45780         TIME_WAIT   -
tcp6       0      0 localhost:40582         localhost:ftp           TIME_WAIT   -
-={( :!: )}=-
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TrevorH
Site Admin
Posts: 33219
Joined: 2009/09/24 10:40:56
Location: Brighton, UK

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by TrevorH » 2017/11/07 13:50:56

Are you sure you've given the right ip address and port to connect to? Since you've obscured that very useful and essential piece of information from your screenshot, there's not much anyone else can do to help.
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
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PUREXER
Posts: 4
Joined: 2017/11/07 03:04:34

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by PUREXER » 2017/11/07 15:04:25

TrevorH wrote:Are you sure you've given the right ip address and port to connect to? Since you've obscured that very useful and essential piece of information from your screenshot, there's not much anyone else can do to help.
thanks

Yes I've double checked the IP Address the ports (25 & 465)

Can you give me a copy of a working mail server settings files (postfix, stmpd, amavis, dovecot, clamav, ...) if you have one.
just to recheck my configs.

because I don't see were is the problem come except a misconfiguration
-={( :!: )}=-
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tunk
Posts: 1206
Joined: 2017/02/22 15:08:17

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by tunk » 2017/11/07 15:14:50

You could use a port scanner on windows to see if the ports are open and something are listening on them.
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TrevorH
Site Admin
Posts: 33219
Joined: 2009/09/24 10:40:56
Location: Brighton, UK

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by TrevorH » 2017/11/07 18:45:49

If you get a GUI popup like that then it's not coming from any MTA like postfix/sendmail etc. What client were you using there?
The future appears to be RHEL or Debian. I think I'm going Debian.
Info for USB installs on http://wiki.centos.org/HowTos/InstallFromUSBkey
CentOS 5 and 6 are deadest, do not use them.
Use the FAQ Luke
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PUREXER
Posts: 4
Joined: 2017/11/07 03:04:34

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by PUREXER » 2017/11/08 14:18:24

tunk wrote:You could use a port scanner on windows to see if the ports are open and something are listening on them.
I've scanned the ports & I think there's no problem

Code: Select all

C:\>netstat -an

Connexions actives

  Proto  Adresse locale         Adresse distante       État
  TCP    0.0.0.0:135            0.0.0.0:0              LISTENING
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1536           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1537           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1538           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1539           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1540           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:1541           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:3306           0.0.0.0:0              LISTENING
  TCP    0.0.0.0:7680           0.0.0.0:0              LISTENING
  TCP    127.0.0.1:5939         0.0.0.0:0              LISTENING
  TCP    127.0.0.1:8165         127.0.0.1:8166         ESTABLISHED
  TCP    127.0.0.1:8166         127.0.0.1:8165         ESTABLISHED
  TCP    127.0.0.1:8167         127.0.0.1:8168         ESTABLISHED
  TCP    127.0.0.1:8168         127.0.0.1:8167         ESTABLISHED
  TCP    127.0.0.1:8169         127.0.0.1:8170         ESTABLISHED
  TCP    127.0.0.1:8170         127.0.0.1:8169         ESTABLISHED
  TCP    127.0.0.1:8194         127.0.0.1:31662        ESTABLISHED
  TCP    127.0.0.1:8216         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8219         127.0.0.1:31662        ESTABLISHED
  TCP    127.0.0.1:8223         127.0.0.1:31662        ESTABLISHED
  TCP    127.0.0.1:8496         127.0.0.1:31662        ESTABLISHED
  TCP    127.0.0.1:8509         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8514         127.0.0.1:8515         ESTABLISHED
  TCP    127.0.0.1:8515         127.0.0.1:8514         ESTABLISHED
  TCP    127.0.0.1:8596         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8647         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8648         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8665         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8716         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8722         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8743         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:8744         127.0.0.1:31663        ESTABLISHED
  TCP    127.0.0.1:31662        0.0.0.0:0              LISTENING
  TCP    127.0.0.1:31662        127.0.0.1:8194         ESTABLISHED
  TCP    127.0.0.1:31662        127.0.0.1:8219         ESTABLISHED
  TCP    127.0.0.1:31662        127.0.0.1:8223         ESTABLISHED
  TCP    127.0.0.1:31662        127.0.0.1:8496         ESTABLISHED
  TCP    127.0.0.1:31663        0.0.0.0:0              LISTENING
  TCP    127.0.0.1:31663        127.0.0.1:8216         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8509         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8596         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8647         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8648         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8665         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8716         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8722         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8743         ESTABLISHED
  TCP    127.0.0.1:31663        127.0.0.1:8744         ESTABLISHED
  TCP    127.0.0.1:53230        127.0.0.1:53231        ESTABLISHED
  TCP    127.0.0.1:53231        127.0.0.1:53230        ESTABLISHED
  TCP    xxx.xxx.xxx.xxx:139    0.0.0.0:0              LISTENING
  TCP    192.168.1.65:139       0.0.0.0:0              LISTENING
  TCP    192.168.1.65:8516      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8517      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8518      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8519      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8520      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8521      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8522      xx.xxx.x.xx:993        ESTABLISHED
  TCP    192.168.1.65:8523      xx.xxx.x.xx:993        ESTABLISHED
  TCP    192.168.1.65:8524      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8525      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8526      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8527      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8528      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8529      sss.ss.sss.ss:143      ESTABLISHED
  TCP    192.168.1.65:8530      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8533      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8534      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8535      sss.ss.sss.ss:143      ESTABLISHED
  TCP    192.168.1.65:8562      xx.xxx.x.xx:993        CLOSE_WAIT
  TCP    192.168.1.65:8566      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8567      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8568      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8570      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8585      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8588      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8595      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8633      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8646      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8650      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8667      xx.xxx.x.xx:993        CLOSE_WAIT
  TCP    192.168.1.65:8670      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8671      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8674      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8675      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8683      74.125.206.109:993     ESTABLISHED
  TCP    192.168.1.65:8684      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8685      sss.ss.sss.ss:143      ESTABLISHED
  TCP    192.168.1.65:8686      sss.ss.sss.ss:143      ESTABLISHED
  TCP    192.168.1.65:8687      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8688      sss.ss.sss.ss:993      ESTABLISHED
  TCP    192.168.1.65:8802      xx.xxx.xxx.xxx:443     TIME_WAIT
  TCP    192.168.1.65:8803      xx.xxx.xxx.xx:443      TIME_WAIT
  TCP    192.168.1.65:8804      xx.xx.xx.xxx:10443    ESTABLISHED
  TCP    [::]:135               [::]:0                 LISTENING
  TCP    [::]:445               [::]:0                 LISTENING
  TCP    [::]:1536              [::]:0                 LISTENING
  TCP    [::]:1537              [::]:0                 LISTENING
  TCP    [::]:1538              [::]:0                 LISTENING
  TCP    [::]:1539              [::]:0                 LISTENING
  TCP    [::]:1540              [::]:0                 LISTENING
  TCP    [::]:1541              [::]:0                 LISTENING
  TCP    [::]:3306              [::]:0                 LISTENING
  TCP    [::]:7680              [::]:0                 LISTENING
  TCP    [::1]:1575             [::]:0                 LISTENING
  UDP    0.0.0.0:123            *:*
  UDP    0.0.0.0:500            *:*
  UDP    0.0.0.0:4500           *:*
  UDP    0.0.0.0:5050           *:*
  UDP    0.0.0.0:5353           *:*
  UDP    0.0.0.0:5355           *:*
  UDP    0.0.0.0:59349          *:*
  UDP    127.0.0.1:1900         *:*
  UDP    127.0.0.1:56163        *:*
  UDP    xxx.xxx.xxx.xxx:137    *:*
  UDP    xxx.xxx.xxx.xxx:138    *:*
  UDP    xxx.xxx.xxx.xxx:1900   *:*
  UDP    xxx.xxx.xxx.xxx:5353   *:*
  UDP    xxx.xxx.xxx.xxx:56161  *:*
  UDP    192.168.1.65:137       *:*
  UDP    192.168.1.65:138       *:*
  UDP    192.168.1.65:1900      *:*
  UDP    192.168.1.65:5353      *:*
  UDP    192.168.1.65:56162     *:*
  UDP    [::]:123               *:*
  UDP    [::]:500               *:*
  UDP    [::]:4500              *:*
  UDP    [::]:5353              *:*
  UDP    [::]:5355              *:*
  UDP    [::]:59350             *:*
  UDP    [::1]:1900             *:*
  UDP    [::1]:56160            *:*
...
TrevorH wrote:If you get a GUI popup like that then it's not coming from any MTA like postfix/sendmail etc. What client were you using there?
I'm using Mozilla Thunderbird 52.4.0
-={( :!: )}=-
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tunk
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Joined: 2017/02/22 15:08:17

Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by tunk » 2017/11/08 15:30:54

I don't have any experience with netstat, but I guess that this only lists ports on the windows PC.
You need something like nmap for windows to check the ports on your server: https://nmap.org/book/inst-windows.html
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hunter86_bg
Posts: 2019
Joined: 2015/02/17 15:14:33
Location: Bulgaria
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Re: Sending messages via client software (eg.: thunderbird) outgoing SMTP problem

Post by hunter86_bg » 2017/11/09 05:12:05

Simple 'telnet' client works both from Linux and Windows.
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