Virtualmin can't receive email but can send

I sent myself an email from my Yahoo account and I received it. Now I’m having some issue with Outlook sending. But at least I know the email works. I used Roundcube to send.

I just sent you one via telnet and it was accepted.


Thank you for all your time again and again!!! Will there be a danger leaving this port open? I don’t want to become a relay

One more question

I’ve used Roundcube to send the mail… I tried to use Outlook and here is what I got

Your message did not reach some or all of the intended recipients.

Subject: RE: mail server test

Sent: 7/16/2020 11:11 PM

The following recipient(s) cannot be reached:

‘Richard M’ on 7/16/2020 11:11 PM

Server error: ‘554 5.7.1 <>: Relay access denied’

Do you have any idea why Roundcube would work and Outlook wouldn’t?

Better you ask someone who knows something about Debian / Ubuntu how to secure your mail. I believe they use their own firewall, and what I don’t know about Postfix could fill volumes. I just use the defaults for the most part unless it starts throwing warnings.

Outlook seems to receive just fine. But when I send it doesn’t seem to go through

The defaults on Virtualmin seem to work fine. I’ll keep working on the Outlook issue… but at least I know it works! Thank you soooo much!

Have a good evening Richard!

I know even less about Outlook than I do about Postfix. But a wild stab would be that Roundcube is on the same server, so it knows where the mail server is. You still need to make the changes @calport advised earlier for the rest of the Interwebs to know. (I missed the CNAME earlier. Long day…)


Thank you! I’ll work on it again tomorrow. All of you have a great evening. Your help is invaluable!!!


Good night. You’re welcome.


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