# To use the postscreen(8) service to block mail
A VPS doesn’t just have more RAM, disk space, and a proprietary share of CPU than a shared account. Depending on the provider, some VPS plans offer burstable memory, which is a pool of RAM set aside for extraordinary events. This is the stuff that can help counter the so-called “Digg-effect,” that much-whispered about occurrence that’s the simultaneous hope and fear of everyone who runs a web site. When you have an unexpected high traffic event, burstable memory will call on a pool of reserved, shared memory to satisfy the needs of temporary high traffic. This is not available on shared servers and, while the necessary memory is available on a dedicated server, your site might not get the kind of traffic on a daily basis to justify the expense of a dedicated server. Again, not all VPS plans have burstable memory, so ask your provider if their VPS plans do.
VPS, on the other hand, is an isolated playground specifically for you. You will be able to install and use any professional software you need. It also provides more opportunities for caching the content. Imagine that you implement caching tools to provide your users with better experience and reduce the loading time of your website. Caching means that the part of requests to your website will be processed using RAM instead of a hard drive. Eventually, RAM will be filled with these requests. Since VPS deals offer more RAM then shared packages, you will get better performance using caching.
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For managing the content of individual sites, I recommend using a well-supported Content Management System (CMS) such as WordPress or Drupal. Even very basic sites need to be updated regularly and a content management system makes this much easier, as well as giving you access to themes and plugins that add useful functions such as search forms, contact forms with spam protection, image galleries, event calendars, online shops and so on. Proprietary systems or “website builders” generally have more limited features and can be very difficult to update or move to a new host.
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There are numerous open source Linux virtualization platforms based on KVM, while Microsoft has Hyper-V with Windows cloud servers, Citrix maintains the Xen server framework, and VMware has a number of different hypervisor frameworks such as ESXi. Hypervisors permit the managing of multiple web servers independently on shared hardware each with isolated databases, file storage, and I/O request processing.
You can check your hostname under Webmin > Networking > Network Configuration > Hostname and DNS Client. Unfortunately, some hosting companies overwrite this information every time a VPS is rebooted - you may need to contact them to get it changed. Choose a fully-qualified subdomain that you own, such as "webserver.mydomain.com" or "mail.mydomain.com". Do NOT accept a generic name provided by the hosting company if you will be sending email from the server because spam filters will block it and you can't easily generate SSL certificates for it.
A2 Hosting offers two VPS options. They are both great options and very affordable. The entry level option is just $9.89 per month, and the Cloud VPS is $15. They are both great choices and will be able to meet all your needs for most entry level or mid-sized sites.
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The Virtualmin interface is another way a hacker could get root access to your server. I strongly advise enabling two-factor authentication for all top-level Webmin users or any user with "sudo" access. You can do this at Webmin > Webmin Configuration > Two-Factor Authentication. I find it easiest to select "Google Authenticator" as the provider but to actually use Authy to do the authentication (because it saves messing around with API keys and because you can recover your account if you lose your phone).
The most obvious and popular reason for a VPS is to run a single website, or multiple websites. However, you can use them for pretty much anything that requires access to the internet – such as a web application like Nextcloud to run your own Dropbox alternative – or to create your own virtual private network to better secure the internet connection of your PCs and mobile devices.