Virtualmin failed 550 5.1.1

Help! (Home for newbies)
1
SYSTEM INFORMATION
OS type and version centos-8
Virtualmin version 7.1

So I am not sure how to get started.

I have a domain/virtual server say primary.com which uses Google Workspace for sending and receiving emails.

Now i added another server secondary.com which does not use google workspace and uses virtualmin inbuild capabilities to send and receive emails.

Now if i try to send emails from secondary.com to primary.com it will fail giving error virtualmin failed 550 5.1.1

I can send emails from a@secondary to any other email like something@gmail.com but not to @primary.com.

Also digging deeper, somehow i had email enabled for primary virtualserver and it kept in delivering emails to usermin account vs my google workspace.

I disabled it and now i am getting this error.

Looking at mail log, this is the error

Sep 25 05:07:34 HOST postfix/smtpd[14041]: NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 me@primary.com: Recipient address rejected: User unknown in local recipient table; from=hello@secondary.com to=me@primary.com proto=SMTP helo=

Please note, i am using fake domains here and host is my virtual server.

Can somehow help me with this.

Please do let me know if any more details are required.

2

@kyrawebinc,

Do you have email enabled for @primary.com in Virtualmin by any chance? If so, the server will attempt to hijack the request.

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3

I had it but it’s now disabled but still the error.

I forgot to mention that my server/host name is setup in a following format.

Ns19.primary.com

And so I actually have 2 server instances

Ns19.primary.com and also primary.com

I read few articles that this can possibly create a conflict and it’s better to change the host name so I am in works on getting the host name changed to something else (another domain)

4

@kyrawebinc,

Yes, you should never use the “naked” domain for a server hostname.

Hostnames should always have a sub-domain in front of them: “server.hostname.com”

If you’d like me to help you diagnose the actual cause of your problem, I will be available tomorrow as I’ll be out today. Drop me a line.

I work with clients who send out millions of messages per day in a multi-server cluster environment I developed for them. I know email quite well.

5

disable local email for primary.com , fix MX entries in nameserver to only point to evilcorp workspace (+SPF/DMARC accordingly to evilcorp) and remove any other mail references pointing to your own server…