SpamDuster Cloud or On-Premise?

Both run the same filtering; the difference is who runs the server. Cloud includes a number of domains and email addresses per plan, with expansion packs for more; On-Premise includes unlimited domains and mailboxes on each licensed mail server with a supported control panel, with domain packs for the rest. SpamDuster Cloud, run by us on Linode, and SpamDuster On-Premise Inbound, which you run yourself, are available now; On-Premise Outbound is coming soon.

The difference in one line

SpamDuster Cloud and SpamDuster On-Premise run the same filter; with Cloud we run the server, with On-Premise you do.

Side by side

	SpamDuster Cloud	SpamDuster On-Premise Inbound	SpamDuster On-Premise Outbound
Available	Yes	Yes (marketplace listings coming soon)	Not yet
Filters	Mail you receive	Mail you receive	Mail your servers send
Who runs the server	We do, on Linode	You do	You do
Mail servers protected	One	Each licensed mail server	Each licensed mail server
Where it runs	A dedicated server of yours on Linode	VMware ESXi, Microsoft Hyper-V, KVM or Proxmox, or a physical server (BIOS or UEFI); or your own AWS, Google Cloud or Azure account	VMware ESXi, Microsoft Hyper-V, KVM or Proxmox, or a physical server (BIOS or UEFI)
Licensing	One charge, monthly or yearly, server included	$360 a year per mail server, 5 mail servers or more; or domain packs	$720 a year per mail server, 5 mail servers or more; or domain packs
Domains and mailboxes	Per plan, from 100 domains and 1,000 addresses; expansion packs add more	unlimited on each licensed mail server with a supported control panel (cPanel & WHM, Plesk on Linux or Windows, and DirectAdmin); domain packs for domains added by hand or through the billing API	unlimited on each licensed mail server with a supported control panel (cPanel & WHM, Plesk on Linux or Windows, and DirectAdmin); domain packs for domains added by hand or through the billing API

Choose SpamDuster Cloud when

you want inbound filtering without running another machine;
you want us to run the server for you.

Choose On-Premise when

filtering must run on your own infrastructure or in your own cloud account;
you need to filter the mail your servers send, which only SpamDuster On-Premise Outbound does.
you have several mail servers to protect: a SpamDuster Cloud filter protects one mail server, while On-Premise is licensed per mail server.

On-Premise Inbound is available now; On-Premise Outbound is coming soon. See SpamDuster On-Premise Inbound and SpamDuster On-Premise Outbound.

How to order

Order SpamDuster Cloud or order SpamDuster On-Premise Inbound in the PortWall billing portal. Both editions run the same filter and the same console, so what you learn on one applies to the other.

Updated 2026-11-01Need help? Open a ticket in the billing portal.