Don't worry this is an issue that many Drupal developers have come across. In particular it raises its head when you add a subdomain.  Your Drupal website is only showing a plain white screen with “The provided host name is not valid for this server" on it. What does it mean and how to fix it. Drupal 8 added a security feature show it isn't possible to spoof the HTTP Host header and trick Drupal into using a different domain name.  Smart move.  So this...

Working through migration on a new Centos 7 server, the default mailbox size is 100MB.  Yes a well organised account doesn't need more than 100MB.  However, how to resolve this size for the outlier people with big mailboxes. In one of our domains being migrated contains an account with 300MB plus and on another domain 400MB plus.  To change the  default size from 100MB run through shell the following command plesk bin subscription_settings --update example.com...