Comparison

Stalw vs Mailcow

Stalw and Mailcow both land on Depends.

Stalw

Depends

Confidence: Medium

Strong fit if you have ops skills and want a free, all-in-one self-hosted mail stack.

Read the full report

Mailcow

Depends

Confidence: Medium

Buy if you're a self-hoster or small org that wants mail sovereignty, can run Docker, and will patch regularly.

Read the full report

Stalw versus Mailcow
Compare	Stalw	Mailcow
Verdict	Depends	Depends
Best for	Self-hosters	Self-hosters and homelab users
Who it's not for	Non-technical teams without a sysadmin	Teams with no Linux/Docker admin capacity
Privacy	Known 2026 denial-of-service vulnerabilities; advisories disclosed openly and a public security page exists.^⁷	Pattern of CVEs 2024-2026 including RCE, SSTI, XSS, and auth bypass; fine if patched fast, risky if neglected.
Support quality	No evidence reviewed	Community forum and docs only; quality unverified
Public sentiment	Self-hosting communities praise it warmly, but large-scale review data is essentially absent.¹⁰	Users praise its completeness but warn it is resource-hungry and overkill for simple needs.¹⁵
Biggest gotcha	Guess: email migration and IP reputation take weeks; plan deliverability warm-up.¹²	"Free" isn't free: expect $170-400/yr VPS plus hours of admin time¹⁶

Pick Stalw when

Self-hosters
Privacy-focused small orgs
Teams replacing hosted Gmail with owned infra
Open-source-first shops

When Stalw is not a fit

Non-technical teams without a sysadmin
Anyone wanting hosted Gmail simplicity
Businesses that can't manage IP reputation and deliverability
One-person shops that just need working email

Pick Mailcow when

Self-hosters and homelab users
Privacy- and sovereignty-focused small orgs
Admins comfortable with Docker
Teams escaping Google Workspace

When Mailcow is not a fit

Teams with no Linux/Docker admin capacity
Businesses where email downtime is unacceptable
Solo users who just need an inbox
Anyone unwilling to manage IP reputation and patching

Sources

Stalwart Mail & Collaboration Serverstalw.art
official
Pricing | Stalwart Labsstalw.art
official
Compare editions | Stalwart Labsstalw.art
official
Product security pagestalw.art
official
stalwartlabs/stalwart on GitHubgithub.com
official
Deploy & Host Stalwart Mail Server . Railwayrailway.com
official
Out-of-Memory Denial of Service advisory (GHSA-jm95-876q-c9gw)github.com
security
CVE-2026-26312 . stalw / stalwartopencve.alliance.unm.edu
security
Vulnerability report for Stalwart Binarysupport.stalw.art
security
Just a shout-out to self-hosting email server StalWartreddit.com
review
Calendars, Contacts and Files in Stalwartnews.ycombinator.com
review
Mailcow vs Postal vs Stalwart: Which Self-Hosted Emailmailflowauthority.com
review
r/stalwartlabsreddit.com
review
Do you run MailCow now? : r/selfhostedreddit.com
review
selfhosted mailservers: mailcow, mailinabox, mailureddit.com
review
Mailcow TCO vs $49 Managed (2026)justemails.app
news