I'm trying to install qmail-toaster in an environment with Almalinux8 using the documentation and script available at http://www.qmailtoaster.net/, after installing it when performing some tests it returns the error "503 auth not available (#5.3 .3)", as shown below:

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:~$ telnet xxx.xxx.xxx.76 25
Trying xxx.xxx.xxx.76...
Connected to xxx.xxx.xxx.76.
Escape character is '^]'.
220 - Welcome to Qmail Toaster Ver. 1.03-3.3.5.qt.md.el7 SMTP Server ESMTP
auth login
503 auth not available (#5.3.3)
^]
telnet> q
Connection closed.
===

Analyzing the patches installed in this version of qmail authentication should be enabled, I've searched and edited several configuration files, but I couldn't release the authentication of messages. I also performed the installation on CentOS 7, changed the supervise run files (smtp, smtps and submission). I performed the same test on ports 587 and 465.

Hello, ribascs & Welcome to LQ.

I tried qmail once, and failed miserably, but I was a newbie then. I could have done it if I had found this: lifewithqmail.org

Also DJB's main site: http://cr.yp.to which he could probably auction for a fortune now, with so much emphasis on anti-hacking & crypto coins.

Bernstein is … well … he's a few sandwiches short of a picnic, and his work reflects that. It's also definitely non LSB compliant.

I have always relied on John Simpson for how to install and use use qmail
https://qmail.jms1.net/
He has patches that fix what DJB didn’t. I’ve been running a production qmail server since 1999 using Simpson’s instructions and patches.
There’s a lot to read, and a lot to learn but JMS definitely has the answers.
You’ll also need to read ALL of DJBs stuff at cr.yp.to probably several times.
Good luck. Have fun!

Hello,
thanks for the help. I had already read these links, but I was not successful in installing or updating qmail

Follow the first rule of research, then: