New install Relay access denied

SYSTEM INFORMATION
OS type and version Ubuntu 24.04.1 LTS
Virtualmin version 7.30.4

This is a fresh install with one domain activated and and one non-admin user. Sending mail to user from gmail receives “Relay Access Denied”

Additionally accessing users mailbox from Webmin Read User Mail gives permission denied response.

I have not modified postfix. Relevant lines in my.cnf are
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = host.example.com

smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination

Thank you for asistance

Sending mail from user to only gmail shows relay access denied or do you get the same error for all mail you send out to the internet?

A quick way to check if your mail can leave your own system and how spammy it would be considered by the rest of the world would be via a service such as https://www.mail-tester.com/

Also: you don’t need to modify postfix at all on a fresh Virtualmin install. Good that you are sticking to defaults. It makes troubleshooting easier.

I don’t know why Read User Email is throwing an error. If Virtualmin → Limits and Validation - Validate Virtual Servers - Fix Permission tab does not fix the issue, you should start a separate topic for this.

Hi,
Thanks for responding. I deleted the domain and recreated it with a single user. reading user mail from Webmin now works but a test mail sent from gmail to user still gives relay access denied.

You need to look at the mail log or the journal for the postfix unit. The client generally doesn’t have useful information for troubleshooting.