Dovecot/Postfix error

SYSTEM INFORMATION
OS type and version Ubutu 18.04
Webmin version latest

I have never used the email in webmin and now I try to set it up using all online help I can find
If I try to send an email to my adress I get this

SASL LOGIN authentication failed: authentication failure

the mail just vanish without a trace. Same when I try to send from the system

I understand its a major problem but I have not enough skills to solve it so I hope for some help

That a login failure. Have you pointed the MX records to your system.
Use https://mxtoolbox.com/ to check your setup.
Steve

@Havouza15,

*** First off, I’d suggest upgrading from Ubuntu 18.04 to either 20.04 or 22.04 as 18.04 is pretty dated and may actually be “End of Life”. ***

Regarding your issue, to offer the best assistance please describe in more detail how you are going about sending email, whether it be within Usermin or an email client like Outlook.

Out of the box, Virtualmin itself is setup to send and receive email by default. So you shouldn’t have to do a great deal of extra configuration.

*** Pro, Affordable, Virtualmin / Server Support https://tpnassist.com ***