postfix setup with 550-Please turn on SMTP Authentication in your mail client

paddyboyuk

Registered
Jul 25, 2020
2
0
1
UK
cPanel Access Level
Root Administrator
Hello, everyone, I am new to the forum, The topic I’m about to ask help for seems to be covered extensively But does not seem to cover my individual circumstances any help or point in the right direction would be greatly appreciated.

To give you an insight into my level of understanding of WHM and C panel is this.

I have been using cPanel for over four years with Hostgator after I find my prices kept shooting up every year with Hostgator I decided to look into hosting my website myself feeling very comfortable with cPanel I decided to investigate more I ended up buying a license it’s slightly overkill for what I need but it’s something I feel extremely comfortable with using, however on the other side WHM is a complete learning curve for me right now.

So far I have got everything set up secured and working as it would with any web host all thanks to WHM and Cpanel being extremely user-friendly, however, this is the problem I am now facing and cannot find a fix.

I have a server that has runs a call answering software that you log in to and when you log in it pops the screen when receiving a call via VoIP, then it lets you send emails through a back system that uses postfix with standard SMTP login details.

I have entered the SMTP details to the postfix files for the Host that are required to work, however for some reason my server is spotting my sub domain (sub.domain.net)For security purposes I cannot list the domain.

Inside the postfix files, this is what the setup looks like to give you an idea

(not real details example only)

Relay hostname.Domain.net
Email address:password

But for some reason, I am getting this bounceback and I don’t know how to fix it, if can somebody please help I have read all of the articles within the forum and searched online but I can’t find a secure way to fix this and I don’t want to switch off the relay safety settings below is a copy of the message being sent back to me hope someone can help.

I HAVE REMOVED MY INFO FOR SAFETY reason


This is the mail system at host sub.domain.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<[email protected]>: host xxx.xxxx.net[IP ADDRESS] said:
550-Please turn on SMTP Authentication in your mail client or log in to the
550-IMAP/POP3 server before sending your message. (SUB.DOMAN.net)
550-[IP ADDRESS]:PORT is not permitted to relay through this server
without 550 authentication. (in reply to RCPT TO command)

Reporting-MTA: dns; SUB.DOMAIN.net
X-Postfix-Queue-ID: 9C5D2200C73
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sat, 25 Jul 2020 12:28:02 -0400 (EDT)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.0.0
Remote-MTA: dns; mail.DOMAIN.net
Diagnostic-Code: smtp; 550-Please turn on SMTP Authentication in your mail
client, or login to the 550-IMAP/POP3 server before sending your message.
(SUB.DOMAIN.net) 550-[IP NUMBER]:PORT is not permitted to relay
through this server without 550 authentication.



PLEASE CAN SOMEONE HELP ME IT SENDING ME MAD
 

cPanelLauren

Product Owner
Staff member
Nov 14, 2017
13,296
1,252
313
Houston
Hello,


Is the DNS for the sub domain's root domain managed on the cPanel server? If so you'd want to remove sub.domain.tld from /etc/localdomains and add it to /etc/remotedomains
 

paddyboyuk

Registered
Jul 25, 2020
2
0
1
UK
cPanel Access Level
Root Administrator
Hi thanks for your reply, I have done this and this is what is coming back to me also

This is the mail system at host host.domain.net.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<[email protected]>: host host.domain.net[ip number] said:
550-Please turn on SMTP Authentication in your mail client, or login to the
550-IMAP/POP3 server before sending your message. (host.domain.net)
550-[IP address]:33484 is not permitted to relay through this server
without 550 authentication. (in reply to RCPT TO command)

Reporting-MTA: dns; host.domain.net
X-Postfix-Queue-ID: 74F81200C71
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Tue, 28 Jul 2020 06:34:02 -0400 (EDT)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.0.0
Remote-MTA: dns; host.doomain.net
Diagnostic-Code: smtp; 550-Please turn on SMTP Authentication in your mail
client, or login to the 550-IMAP/POP3 server before sending your message.
(host.domain.net) 550-[ip number ]:33484 is not permitted to relay
through this server without 550 authentication.