SOLVED Local Mail Exchanger with remote MX

TiagoFreitas

Registered
May 31, 2017
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Portugal
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Website Owner
Hello,

We are trying to configure our e-mail in this way:

- MX is set to Google Suite where e-mails initially go
- If the user exists in Google, it stays there
- If the user doesn't exist, it gets routed to another server (cpanel). This is at a hosting company and we only have access to cpanel.
- When the email gets to the cpanel server, it gets rejected with the error:
550 SMTP AUTH is required for message submission on port 587

Cpanel configurations:
- Routing is set to Automatically Detect Configuration : Local Mail Exchanger
- MX is Google servers
We had to ask the hosting company to make this configuration because cpanel was automatically changing the routing to Remote Mail Exchanger when MX was set to Google, which we don't want. We want it to accept e-mails to local users, the only difference is they will be always coming from Google's servers using a routing rule and not through MX.

We think we are getting the error because cpanel is not considering the domain as local so user is remote. It should be local. But the e-mail account is created in cpanel.

Thanks in advance.

This is the full error in the delivery event:
Code:
Event: rejected
User: -remote-
Domain:
Sender: [email protected]
Sent Time: May 31, 2017 9:55:09 AM
Sender Host: mail-vk0-f71.google.com
Sender IP: 209.85.xxx.xx
Authentication: unauthorized
Spam Score: 0
Recipient: [email protected]
Delivery User: volter
Delivery Domain: example.com
Delivered To:
Router: reject
Transport: **rejected**
Out Time: May 31, 2017 9:55:09 AM
ID: 1dFzPm-0009TY-IM
Delivery Host: mail-vk0-f71.google.com
Delivery IP: 209.85.xxx.xx
Size: 0 bytes
Result: SMTP AUTH is required for message submission on port 587
 

TiagoFreitas

Registered
May 31, 2017
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Portugal
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Website Owner
MX records on a per-email-account
I don't need per-email-account.
I just needed that cpanel ignores the MX records when receiving mail, and behaving normally. MX is to be used by those sending e-mails.
If it receives an e-mail for a local domain, it should accept it (if the user exists) or give an error if the user doesn't exist. As simple as that..

There is really no workaround for this? Google officially supports it and I'm sure many people would like to use it because google for bussiness is expensive when you have many accounts and it makes sense to have some of them on another server.

Thanks.
 

TiagoFreitas

Registered
May 31, 2017
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Portugal
cPanel Access Level
Website Owner
There used to be an option in MX editor:
"Always accept mail locally even if the primary mx does not point to this server."

Exim (/etc/localdomains) problem after recent update

So there is no way anymore? And no way to add an exception to EXIM?

This also used to work according to these instructions:

theemaillaundry.com/knowledgebase/adding-mx-records-in-cpanel/

Thanks
 
Last edited by a moderator:

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,201
363
Hello,

Could you open a support ticket using the link in my signature so we can take a closer look? You can post the ticket number here so we can update this thread with the outcome.

Thank you.
 

TiagoFreitas

Registered
May 31, 2017
4
0
1
Portugal
cPanel Access Level
Website Owner
It turned out it works, I was just connecting to the wrong port.

Port 25 accepts mail with SSL/TLS without authentication for local users.
Port 587 only accepts with authentication.

I didn't know this and got lucky because I tried with another server I have and found out qmail-smpt works the same way.

Thanks
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,201
363
Hello,

I'm happy to see the issue is now solved. Thank you for updating us with the outcome.