If emails on your Directadmin server stopped delivering to your users, and the error "550 Email blocked by combined.rbl.msrbl.net" is reported, here is what you should do.
If you have a custom installation of cURL with support of HTTP/2 and the recent version 7.54.0 fails to built with the error: implicit declaration of function 'SSL_CTX_set_srp_username', here is how you can fix it.
Here you can find a guide on how to create a cronjob to use sa-learn to teach spamassassin for all existing users on your server with Directadmin.
NGINX 1.13.0 mainline version has been released on 2017-04-25 with a support of TLSv1.3. And while we are waiting for an official release of OpenSSL 1.1.1 we prepared a guide on how to get NGINX as a reverse proxy working with TLS v1.3 on Directadmin server with custombuild 2.0.
Having 10-20-30... domains (and more) in ca.san_config is a challenge to get them verified at once. As it fails randomly with HTTP/500 error. Solved by giving a chance to re-try...
If Directadmin fails to write customization into NGINX configs with an error "Unable to write customization" and details show "24: Too many open files" when checking its configuration. That happens due to nproc limit of Directadmin.
Installation of PECL extensions on a server with Directadmin is rather simple, but at the same time many users are confused with it. Here is a guide on how to make it in a easy way.
I have set up dmarc on the server. I am receiving daily reports from Yahoo and Hotmail with no problem. But email reports from Gmail from address: firstname.lastname@example.org are frozen and rejected by the server.
If for any reason you want to uninstall proftpd and/or pureftpd in Directadmin and don't want to run any FTP server at all. Here is a guide on how to complete it.
Should you want to run PHP scripts in behalf of the script owner. Or you have issues with modifying uploaded via HTTP files in a FTP client or in Directadmin File Manager. Probably you see various errors similar to "Permission denied". Then you might consider installing mod_ruid2 to your mod_php.