Recently I`ve started digging into mail server settings and the need for tighter security. Some of the findings are startling ! I have found to my cost that not having the settings described below can cause major issues with sending and receiving email.
When upgrading to MariaDB I found some queries were getting rejected due to field value not being NULL. On mysql this was not a problem as I had intended if no data then I`m happy with the query.
The internet started in earnest around the mid 1990`s. About that time CompuServe and Aol provided email systems to help people communicate. In the early 1990`s bulletin boards were all the rage allowing easier communications across the globe.
Your website and email are identified by a domain name. behind this is an IP address. The IP identifies through the system where the domain is situated. I have some hints below that can be used to verify that your domain is setup correctly.
We run regular backups of our website using a utility called `wget` This replicates the website files and any files that have been uploaded (for example PHP, JPG, MP4 files)
Unfortunately this morning we had an attack on our myclub website. A break in occurred on my username which allowed a user access to the system. This was quickly detected but caused us to change the system password.
We had an experience this evening with DNS server settings where our website DAFC.net mysteriously changed. This had the effect of taking our domain offline and pointing to an unsafe server.