New Mail Server - Route only OUTBOUND emails to smtp.domain.tld

Hi,

I have setup a new outgoing email server (smtp.DOMAIN.COM) as per the ISPConfig 3.1 Manual; Installing A Multiserver Setup With Dedicated Web, Email, DNS And MySQL
Database Servers On Debian 8 With ISPConfig 3.1. I am actually on Debian 9 and ISPConfig 3.2.7p1 This server is showing up all OK in Monitor and System.

I deleted then re-added one of my email domains to use the smtp.DOMAIN.COM server and I can send email with no apparent problem (although I cannot receive email via smtp.DOMAIN.COM).

What I would like to do is somehow route only outbound emails to smtp.DOMAIN.COM from one domain but still receive email on main.DOMAIN.COM.

Is there a simple way to achieve this please?

As always, many thanks in advance for your kind help

Kind regards to all

HTA

 

Hi Jesse, thanks for the reply.

What I said was that I set up the new smtp server as per the Manual. The manual I own is titled "Installing A Multiserver Setup With Dedicated Web, Email, DNS And MySQL Database Servers On Debian 8 With ISPConfig 3.1." I followed all steps to create the new SMTP server which is part of a multi server environment.

I have three servers (all setup in Multi Server Config on Debian 9) which are as follows: -

main.DOMAIN.COM (ISPConfig 3.2.7p1 - ISPConfig Admin Panel, Web, Email, DNS primary, MySQL)
slave.DOMAIN.COM (ISPConfig 3.2.7p1 - DNS slave)
smtp.DOMAIN.COM (ISPConfig 3.2.7p1 - Email)

 

Thank you for pointing me in the right direction here. I had not spotted the "Show per domain relay options" option! Now in Email Domain config I can see the Relayhost options - Brilliant!

I hope I am not being stupid here but, who is the Relayhost User and Relayhost Password? Is it the system admin login or any user from the domain to be relayed?

Once again Jesse many thanks for your very helpful information.

Hope you have a great weekend

Kind regards

HTA

 

Hi Jesse,

Many thanks for your time.

Still no further on! Looking at the mail log on main.domain.com I see this failure: -

Code:

Feb 26 17:15:18 main postfix/error[32483]: 0F65026C71D4: to=<[email protected]>, relay=none, delay=0.05, delays=0.02/0.02/0/0.01, dsn=4.7.0, status=deferred (delivery temporarily suspended: SASL authentication failed; cannot authenticate to server smtp.DOMAIN.com[xxx.xxx.xxx.xxx]: generic failure)

smtp.DOMAIN.com IP Address is correct!

I even re-installed smtp.DOMAIN.COM this afternoon using the "autoinstaller": -
https://www.howtoforge.com/tutorial/ispconfig-multiserver-setup-debian-ubuntu/3/

Totally confused

Kind regards

HTA

 

The thing that is confusing me is that smtp.DOMAIN.com is part of ISPConfig multi-server environment.

So I am very confused as to how to authenticate with smtp.DOMAIN.com from main.DOMAIN.COM?

Should I have to, somehow created a user in smtp.DOMAIN.com so that I can enter this user on the Relay User and Relay Password fields?

I can see that smtp.DOMAIN.com is online in Control Panel

Totally confused and frustrated to be honest!

Kind regards

HTA

 

It seems that is what @Jesse Norell wrote in #6.