How block an email address using Usermin (Virtualmin)
In order to block an email address using Usermin, one has to log into the Usermin interface. The URL is typically: https://mail.server.com:20000 After login, you
Postfix timeout after DATA (0 bytes) on either smtp or submission port
If you get the following error in your Postfix log file, and email clients just appear to be hanging (e.g. stuff in Outbox): Aug 3
How to whitelist a domain in Virtualmin that is being delayed by Greylisting all the time
Background Greylisting is a common technique to keep once-off spammers away from a mail server. By using timing and a triplet system based on sender
Mac computer repeatedly prompts for password but small print is about maximum number of connection from user+IP exceeded mail_max_userip_connections=10
When you have these symptoms: Mac computer repeatedly prompts for password but small print is about maximum number of connection from user+IP exceeded mail_max_userip_connections=10 This
Newly installed Virtualmin server, email sending repeatedly prompts for password
On a freshly installed Virtualmin server strange behavior in terms of email sending. Everything looks perfect on port 465 and 587, but sending clients are
Basic guide to set up DMARC on a WHM / cPanel server
DMARC is actually quite easy, because it’s just a TXT record. There are a multitude of options, so best to choose some intelligent defaults to
How to delete messages from the Sendmail queue
First check the size of the queue: # mailq | tail -n 1 Total requests: 35971 Use this command to delete the mess: find .
What to do when you get warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
If you get the problem below, trimmed and highlighted in bold: SASL authentication failure: cannot connect to saslauthd server At least run the command below
How to use monit to automatically restart Usermin on port 20000 if it fails
What is Monit? Monit is a free and open-source process monitoring utility for Unix and Linux systems. It provides a way to monitor various aspects
How to deal with “Reverse DNS does not match SMTP Banner” on a Virtualmin Postfix server
On a newly installed control panel you might have this situation: Hostname: example.ispdomain.com Client domain: example.com This might cause problems with MX Toolbox’s health check