Can't setup mail server | Pterodactyl® | Page 1

rich glacier Dec 29, 2024, 7:30 PM

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https://reintech.io/blog/setting-up-mail-server-postfix-almalinux-9
Hello! I have fallowed this tutorial for setting up a mailserver with postfix
The mailserver seems to be working, as I can receive and send e-mails, but I can not set it up in the panel due to stream_socket_client() error.
My SMTP server is hosted on a different host than the panel.
Also, do you need to put your ssh user's creds on the user and password fields?(may be a stupid question but im learning)
Should I make any more changes to Postfix server, any more thats on that tutorial?
Thank you.

rich glacier Dec 29, 2024, 7:50 PM

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if I do # telnet [mydomain.tld] 25
I get:
Connecting To [mydomain.tld]...Could not open connection to the host, on port 25: Connect failed
Maybe is something on /etc/postfix/main.cf that I should change? if so, what exactly?
As a reminder, I can send and receive e-mails

vivid veldt Dec 29, 2024, 8:01 PM

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You can send and receive from where?

rich glacier Dec 29, 2024, 8:08 PM

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vivid veldt You can send and receive *from where*?

I can send from the mailserver(different VPS from the panel's VPS) to any mail server like Google
I can aswell receive e-mails from external mail servers like Google

vivid veldt Dec 29, 2024, 9:27 PM

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Right, so that just means postfix is working

But your panel machine can't reach your mail server for whatever reason
Timeouts are usually firewall or routing related. Some providers even block SMTP connections

rich glacier Dec 29, 2024, 9:47 PM

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vivid veldt Right, so that just means postfix is working But your panel machine can't reac...

my mail server host is hosted by a big hosting provider, so I shouldnt have any problem with this
If the port would had been blocked, then the emailing shouldnt work, right?

rich glacier Dec 29, 2024, 9:48 PM

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vivid veldt Right, so that just means postfix is working But your panel machine can't reac...

https://contabo.com/blog/how-to-set-up-a-smtp-server/
even their documentation speaks about it

rich glacier Dec 29, 2024, 9:49 PM

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vivid veldt Right, so that just means postfix is working But your panel machine can't reac...

yup, its not blocked

vivid veldt Dec 29, 2024, 10:37 PM

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Who is your panel provider?

rich glacier Dec 30, 2024, 1:30 AM

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vivid veldt Who is your **panel** provider?

well, its under a vpn hosted by the VPS where I keep the mailserver

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its home-self hosted

rich glacier Dec 30, 2024, 1:31 AM

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rich glacier well, its under a vpn hosted by the VPS where I keep the mailserver

so its unrelated because I can access any port even if my ISP has blocked it under my self hosted VPN

vivid veldt Dec 30, 2024, 1:32 AM

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Right, then look into your VPN being misconfigured
The connection is timing out. So something somewhere is blocking the connection

rich glacier Dec 30, 2024, 1:33 AM

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vivid veldt Right, then look into your VPN being misconfigured The connection is timing out....

I can do telnet server-ip 25 in my VPS(where the mailserver is hosted) but not from outside

rich glacier Dec 30, 2024, 1:34 AM

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rich glacier yup, its not blocked

which..

vivid veldt Dec 30, 2024, 1:35 AM

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From your mail server is irrelevant
You need to be doing things from your PANEL machine. That's what is giving you the error

rich glacier Dec 30, 2024, 1:36 AM

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vivid veldt From your mail server is irrelevant You need to be doing things from your PANEL...

https://serverfault.com/questions/574164/centos-postfix-smtp-server-connection-refused-from-outside

Server Fault

CentOS postfix smtp server connection refused from outside

I am quite stuck with my postfix/smtp configuration on my CentOS machine.

I setup a mail dns mail.domain.tld, configured in the postfix main.conf file and tested
locally on the server by connectin...

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I tried enabling the submission port but I havent gotten me anywhere

bitter patio Dec 30, 2024, 1:37 AM

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rich glacier https://serverfault.com/questions/574164/centos-postfix-smtp-server-connection-r...

That doesn't counter what Balin said.
You need to be testing from your panel server. That is what can't connect to your SMTP server.
Testing from the mail server is pointless

vivid veldt Dec 30, 2024, 1:38 AM

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As you've shown, and I've confirmed, postfix is publicly accessible - at least to TCP ping. Your PANEL machine can't reach your mail server. Troubleshoot THAT connection

bitter patio Dec 30, 2024, 1:38 AM

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rich glacier I tried enabling the submission port but I havent gotten me anywhere

Enabling submission port doesn't help you. You need to figure out where you're going wrong with your network configuration

rich glacier Dec 30, 2024, 1:39 AM

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vivid veldt As you've shown, and I've confirmed, postfix is publicly accessible - at least t...

may I ask you to do a telnet my-server-ip 25 in private? I can trust you

bitter patio Dec 30, 2024, 1:39 AM

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That isn't going to help you

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You need to do your own tests from your own panel server

vivid veldt Dec 30, 2024, 1:39 AM

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No I'm not going to telnet some random address

rich glacier Dec 30, 2024, 1:40 AM

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just wonderiing if its something from me..

bitter patio Dec 30, 2024, 1:40 AM

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You've already shown its open to public

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This is entirely an issue between your panel server and mail server

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As you've been told multiple times

rich glacier Dec 30, 2024, 1:40 AM

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bitter patio This is entirely an issue between your panel server and mail server

so by saying that you acknowledged that I can send and receive emails from outside, right?

bitter patio Dec 30, 2024, 1:41 AM

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rich glacier yup, its not blocked

YOU already showed this

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So actually troubleshoot your connection BETWEEN the panel and mail server

rich glacier Dec 30, 2024, 1:41 AM

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any hint how..?

rich glacier Dec 30, 2024, 1:43 AM

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bitter patio So actually troubleshoot your connection BETWEEN the panel and mail server

also on the username and password fields I should put one of the machine users creds?(like root user)

bitter patio Dec 30, 2024, 1:43 AM

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Its your network. You need to know how to manage it

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It's nothing Pterodactyl specific

bitter patio Dec 30, 2024, 1:44 AM

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rich glacier also on the `username` and `password` fields I should put one of the machine use...

Only YOU know how you setup authentication on your mail server

rich glacier Dec 30, 2024, 1:44 AM

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ah, so its something else apart from server's users

vivid veldt Dec 30, 2024, 1:44 AM

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Auth doesnt come into anything here
Your connection isn't even reaching your mail server. Let alone even getting to the point of checking auth

rich glacier Dec 30, 2024, 1:45 AM

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I tried from 2 different ips to reach the server..nothing ;/

rich glacier Dec 30, 2024, 1:52 AM

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vivid veldt Auth doesnt come into anything here Your connection isn't even reaching your mai...

so its confirmed the port 25 isnt blocked(screenshot from panel server side)

bitter patio Dec 30, 2024, 1:52 AM

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Your testing against gmail....

rich glacier Dec 30, 2024, 1:52 AM

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i just tried to confirm port 25 isnt blocked, as for example, I cant reach it with my own IP address

vivid veldt Dec 30, 2024, 1:55 AM

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As I said, some providers outright block SMTP.
But if your connection is via a VPN, such would not apply

rich glacier Dec 30, 2024, 1:55 AM

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yep

bitter patio Dec 30, 2024, 1:56 AM

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As you've been told now multiple times. You need to troubleshoot your network issue between your panel server and mail server.
We can't help you with that here.

#Can't setup mail server