Mail Not Receiving In Mailcow

vishnu

I have successfully installed Mailcow in our local environment. I have tested it by sending mail to other domains, and it works fine. However, the mail is not being received when I try to send an email from another domain to Mailcow.

esackbauer

Check again all requirements:
https://docs.mailcow.email/getstarted/prerequisite-system/#firewall-ports

vishnu I try to send an email from another domain

Do you get a bounce message? What exactly does it say?

proomat

Port 25 inbound opened?

ETNyx

Also you could more describe what local environment means in your case and how others domains fit in this enviroment. Mailcow is usually used in public instead.

vishnu

We have installed the Mailcow server on 2 virtual machines. Can we add the same domain to both servers?

ETNyx

In short, do not do this,..

Otherwise, if you connect to your stack via domain, how you will decide, how to route this connection to the correct server?

vishnu

ETNyx We are using different servers(mail.xaasio.com and email.xaasio.com)and routing to the domain xaasio.com is this feasible.

[unknown] A records

vishnu

I have use differnt subdomain mail.xaasio.com and email.xaasio.com

esackbauer

vishnu
What are you talking about? Are these subdomains MX records? A records? What do you mean with “domain”?

esackbauer

vishnu is this feasible.

No it is not. Mailcow is not designed to be run in a cluster (via 2 nodes) for the same mail domain.
Could you please write in plain text what you want to achieve with those 2 VMs.

vishnu

esackbauer We have implemented mail.xaasio.com as dev environment. We also integrated thiswith outlook all works fine.

Now we repeat the same process with email.xaasio.com as production environment.

We have testing by sending and receiving mail in both dev and prod.

Dev environment works perfectly.

But in production environment we are facing the following error:

esackbauer

If both dev and prod environment use the same mail domain “xaasio.com” (which I assume it is according to the sender address), then you can expect problems.
You are mixing them up.

Keep the MX record for xaasio.com pointing only to email.xaasio.com, because you want to receive actual mail.
Of course all other records like SPF and DMARC should also be set up accordingly.

Use a different mail domain (like dev.xaasio.com with a MX record pointing to mail.xaasio.com, and configure the mail domains not in both servers!

vishnu

We have entered MX record as

Is it correct?

esackbauer

Why do you want Microsoft to receive your mails, and not your mailcow installation?

vishnu

We are using both by using split delivery integration

esackbauer

Unfortunately I have no experience with split delivery. I don’t see any benefit from it, in contrast it makes operations and troubleshooting much harder (as we see now with your issue)

Probably you have misconfigured something with MS Outlook protection.