vSMTP
vSMTP: A free, open-source MTA for operators who need scripted SMTP routing and filtering. Ranked #31 of 34 in Mail Server Software by our editors (6.1/10); pricing: Free plan; best for operators scripting SMTP routing and filtering.
At a glance
- Editor score6.1 / 10
- PricingFree plan
- Best forOperators scripting SMTP routing and filtering
- Free planYes
- Paid fromFree
- License modelOpen-source
- Facts checked23 Sep 2026
Where it wins
- Scriptable scenarios can route and filter SMTP traffic
- Can inspect and modify MIME content, including encryption rules
- Modular architecture supports MTA, gateway, and sender roles
Where it doesn't
- Does not provide webmail or mailbox access
- No IMAP/POP3 access or mobile sync
- Commercial support is separate from the free open edition
Our verdict on vSMTP
vSMTP is an SMTP mail transfer agent and email gateway from viridIT, aimed at operators who need control over how email is routed and filtered. Its open edition is free under an open-source license and can serve as a pure MTA, a secured front end, or a mass-email sender. That makes it relevant to teams building mail infrastructure rather than people looking for an end-user inbox. It is available for Linux and self-hosted deployment, with a modular architecture also designed for cloud deployment.
The product's strongest distinction is its filtering depth. Routing and filtering scenarios are written in its scripting language, and vSMTP can analyze SMTP envelope data as well as inspect MIME content. Filtering can modify messages or apply encryption rules. Native plug-ins and an API provide integration paths, while the microservices-based architecture supports deployments that divide functionality into modules. These capabilities suit operators who want policy and routing logic inside the mail transfer layer; they also imply a more infrastructure-focused setup than a mailbox product. Buyers should evaluate whether scripting and operating an MTA fit their team's skills and responsibilities.
The Open edition includes the open-source license, SMTP and MIME filtering, and the MTA, secured-front-end, or mass-sender roles. Commercial support is available separately. vSMTP is not positioned as a mailbox server: it does not offer webmail, IMAP/POP3 access, or mobile sync. Choose it when mail routing, message inspection, and configurable filtering are the core requirements. Choose a different product if users need inboxes, client access protocols, or mobile mailbox synchronization as part of the same system.
Your product? Our editors can test vSMTP in depth and publish a review, labelled as paid · from $149/mo →
vSMTP pricing
All 1 vSMTP plans and prices →
vSMTP fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| License model | Open-source |
| Webmail interface | No |
| IMAP/POP3 access | No |
| Mobile sync | No |
| Antispam tools | Not verified |
| Mailbox limit | Not verified |
| High availability | Not verified |
| Deployment | Cloud, Self-hosted |
| Platforms | Linux |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan (source) |
| Website | viridit.com |
| Facts checked | 23 Sep 2026 |
Alternatives to vSMTP
- Microsoft Exchange OnlineA Microsoft-centric hosted mailbox service with Outlook, archiving, compliance, and migration tools.9.3
- Zimbra CollaborationA broad open-source suite for organizations that need email, collaboration, and deployment control.9.1
- IceWarpA broad hosted email suite with collaboration, migration tools, and self-hosted deployment.9.0
Used vSMTP? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used vSMTP for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
vSMTP is listed in our Mail Server Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/vsmtp/"><img src="https://www.itechguides.com/best/badge/vsmtp.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update