Email Signatures
You Can Prove
Centrally managed, compliant signatures for Microsoft 365 and Exchange. Run it as SaaS, or deploy the entire platform inside your own walls. Either way: one signature, on every client, verifiable by anyone.
Alex Morgan
Director of Partnerships
Signatures worth sending
From clean executive to full campaign - designed once, applied to every mailbox, rendered correctly in every client.
To: board@northwind.example
Subject: Q3 results and outlook
Best regards,
Northwind
Capital Partners
Sarah Al-Otaibi
Chief Financial Officer
Licensed by CMA. This message is confidential and intended solely for the addressee.
To: partners@lumina.example
Subject: Design system handoff
Best regards,
Omar Aziz
Head of Product Design
Lumina Studio
lumina.example
+971 4 555 0122 · Dubai Design District
To: clients@meridian.example
Subject: Your cloud migration plan
Best regards,
Maria Santos
Enterprise Sales · Meridian Cloud
Live event
Meet us at GITEX 2026
Hall 4, Stand B-22 · 13-17 Oct · Dubai
Scheduled 01-15 Oct · variant B · 4.1% CTR
0
email bodies ever stored
AES-256
per-tenant encryption, keys you can rotate
1
signature on every client, never two
Watch your mail flow. Live.
This is the real dashboard - not a mockup. Every capability you enable appears on the diagram the moment it is on.
Built for Microsoft email
Deep, native integration with both worlds of Microsoft mail - cloud and on-premises.
Microsoft 365
- Connectors and transport rules set up automatically
- Signatures stamped in transit - every device, including mobile
- Outlook add-in: preview, one-signature suppression, Sent Items updates
- Directory sync keeps names, titles and photos current
Microsoft Exchange Server
- On-premises Exchange, fully inside your network
- Transport agent stamps on the server - nothing leaves your walls
- Organization and OU-aware policies from your directory
- The same portal, templates and audit as the cloud edition
Sovereign
Your signatures. Your infrastructure. Your choice.
Every other signature platform makes you send your mail through their cloud. StampFlow is the one that lets you keep everything inside your own walls, without giving up a single feature.
SaaS
Managed cloud
Connect Microsoft 365 in minutes. Connectors set themselves up, signatures apply in transit, nothing to install.
Self-hosted
Inside your walls
The full platform on your own VM - your data center, your sovereign cloud, even air-gapped. Built for government and regulated enterprises that cannot let mail leave.
No competitor offers this
MSP
Your brand on it
Run StampFlow as your own white-label signature service. Your name, your logo, your customers, your margin.
One signature. Everywhere.
Users with their own Outlook signatures send two - theirs and the company one. StampFlow silences the personal signature the moment they compose, and stamps the official one in transit.
- Outlook classic, new Outlook, web, Mac and mobile - one toggle covers them all
- No group policy scripts, no registry edits, no per-machine visits
- Signed in transit, so it works from every device including phones
Always disable default Outlook signatures
Suppress personal signatures when users compose
Outlook for Windows and Mac: signature set to none
Outlook on the web and new Outlook: option disabled
Applied at the next compose, fleet-wide
Design once. Deploy to thousands.
A visual designer with live preview, built for people who never want to see HTML - and a code view for those who do.
- Directory-driven placeholders: names, titles, phones, photos - always current
- Conditional blocks per department, language or campaign
- Renders correctly in Outlook classic - the client that breaks everyone else’s HTML
Not just compliant. Provable.
Every stamped email carries cryptographic provenance. A recipient - or an auditor - can verify that a signature was really applied, by your organization, at that moment.
- Public verification page for any stamped message
- Tamper-evident audit trail of every policy and change
- Data-loss prevention checks before mail ever leaves
Signature verified
Stamped by Your Company Ltd. Integrity check passed. Policy: Corporate signature v4.
Encrypted
Encryption even we cannot undo.
Every tenant’s data is encrypted under its own key. Not us, not a database administrator, not a stolen backup can read it. You can rotate the key yourself, from the portal, any time.
Per-tenant keys
AES-256-GCM, rotatable in one click
Nothing to leak
Email bodies are processed in memory, never stored
Standards-mapped
Designed against NCA ECC, ISO 27001 and GDPR controls
Penetration tested
Independently tested, findings closed and verified
Features
Everything a signature platform should be
Visual designer
Drag and drop blocks, live preview, ready-made templates, full code view when you want it
Signature policies
Who gets which signature, by group, department or organization - decided centrally
One signature everywhere
Personal Outlook signatures silenced across Windows, Mac, web and new Outlook
Campaign banners
Marketing banners in every signature - scheduled, targeted and measurable
A/B testing
Run signature variants against each other and keep the one that performs
Recipient targeting
Different signatures for different audiences - internal, external, per domain, per tier
Reply-chain aware
Full signature on the first mail, a compact one deep in the thread - never stacked duplicates
Sent Items updated
The stamped signature written back into senders' Sent folders, so what they see is what was sent
Provenance and proof of send
Cryptographic verification any recipient or auditor can check
Data loss prevention
Credit cards, IDs and custom patterns caught at compose and at the gateway - before mail leaves
Signature intelligence
See the signatures your organization actually receives, and learn from them
Full audit trail
Every change, by whom, from where - with six role levels and per-organization isolation
Built for every team that touches email
IT
One dashboard for every mailbox. No scripts, no per-desk visits, no surprises after updates.
Compliance and Legal
Disclaimers that always apply, provenance an auditor can check, DLP before mail leaves.
Marketing
Campaign banners in every signature, scheduled and A/B tested like a real channel.
Security
Per-tenant encryption, full audit trail, and a mail path that never blocks delivery.
Ready to sign every email properly?
See StampFlow on your own tenant, or talk to us about running it inside your infrastructure. We reply within one business day.