When 2D and 3D acceleration is enabled within VPS Configuration it will show "1) The operation could not be completed" after booting or restarting the server.
One of our clients contacted us because of an error while sending a message using the form within the Prestashop "Contact Us" page.
When you try to send an email, this error usually occurs because the email address does not exist in the remote server.
The scores PageSpeed and YSlow presented in the GTmetrix report represent the web development quality of your page.
Your browser shows a warning symbol and displays a message saying your connection to this site is not fully secure.
Usually, the error "530 Login authentication failed" shows up when the hostname or IP, username, and password you typed in your FTP client is wrong.
We are aware of a few solutions to fix this issue.
Assuming there are no issues on your web server configuration and the remote server is online, you may want to check if the SSL Certificate associated with the external entity is valid.
You sent an email, and it was bounced (returned) back to you.