Souvera Shield
Mail security for users. Reputation for admins.
Souvera Shield protects every inbox with upstream spam and virus filtering – and gives users control over their own quarantine. Administrators additionally get professional reputation management for their own domain.
- Personal quarantine per user
- Reputation score & incidents
- 9 deliverability checks
For end users
Spam control belongs in the user's hands
No waiting for IT: every user manages their own quarantine and their own lists – directly in the workspace.
Overview dashboard
Five counters at a glance: quarantine, whitelist, blacklist plus withheld attachments and viruses – and the new arrivals of the last 24 hours.
Spam quarantine
Review withheld mails via preview (including headers), release or delete – individually or in bulk, with full-text search and CSV export.
File & virus quarantine
View content blocked by the content filter or virus scanner and release it in a controlled manner – if enabled by the administrator.
Personal whitelist
Permanently allow trusted senders or entire domains – every user maintains their own list.
Personal blacklist
Permanently block unwanted senders – without a ticket to IT.
Notifications
Alerts for new quarantine mails, optional daily summary, dashboard widget and results in the unified search.
Reputation management: so your mails arrive
The best email is useless if it lands in the recipient's spam folder. Souvera Shield continuously monitors your domain's delivery reputation – fully integrated, across six dedicated views and without external tools.
All values are based on real measurements – nothing is estimated or simulated.
Reputation score (0–100)
A daily recalculated total score condenses your mail reputation into a single number. Daily snapshots make the trend traceable over 7, 30 or 90 days.
Per-provider reputation
Separate analysis for Google (Gmail), Microsoft (Outlook & Office 365), Yahoo and GMX/Web.de – with volume, DKIM/SPF pass rates and an overall verdict per provider.
Deliverability checks
Automatic and on demand: SPF, DMARC, MTA-STS, TLS-RPT, PTR/HELO, TLS encryption, BIMI, One-Click-Unsubscribe and DNS blacklists. Every warning explains in plain language what to do.
Sending source analysis
All servers that send in your domain's name are extracted from DMARC reports and classified: legitimate, unknown or potentially abusive – so spoofing shows up early.
Incident management
If the daily analysis detects a problem – blacklist entry, dropping pass rates, failed mail test – an incident is created automatically with cause, history and status. Deduplication included.
Real-world mail tests
Every Sunday and any time manually: a test message is sent authenticated through your own mail server and analyzed externally – results reflect your true server reputation.
How your reputation score is composed
Transparently weighted across five real data sources. Components without a sufficient data basis are shown as such and excluded from the calculation.
DMARC analysis
DKIM/SPF pass rates from aggregate reports of the major providers.
Mail-test results
Results of the weekly reputation mail tests via your own server.
Blacklist status
Presence of the sending IP on common DNS blacklists.
Infrastructure
SPF, DMARC policy, MTA-STS, TLS-RPT, PTR/HELO, TLS, BIMI and more.
Incidents
Open reputation incidents with a direct effect on the score.
Provider-specific analysis for
0–100
Daily score
5
Weighted data sources
9
Deliverability checks
1×/week
Automated mail test
Analysis runs daily in the background – can be triggered manually at any time.
Deliverability checks in detail
Nine active checks. One clear picture.
Souvera Shield continuously verifies your domain's entire sending infrastructure. Every warning delivers plain-language explanations and concrete recommendations – the outgoing IP is determined automatically from mail tests, Stalwart host or MX record.
SPF record
Syntax check and control of the 10-lookup limit – an overly long SPF record is a common, often overlooked deliverability blocker.
DMARC policy
Verification of the active policy (none / quarantine / reject) including correctly configured reporting addresses.
MTA-STS
Prevents downgrade attacks on your mail delivery – the policy document and enforcement mode are checked.
TLS-RPT
Receives reports about failed TLS connections and surfaces problems in encrypted delivery.
PTR & HELO
Reverse-DNS and HELO value of the sending IP – large providers treat inconsistent values as a clear spam signal.
TLS encryption
Active check of the server certificate and the negotiated TLS versions for inbound and outbound connections.
BIMI
Brand logo in the inbox: verification of the VMC certificate and DNS records – a visible trust signal for recipients.
One-Click-Unsubscribe
RFC 8058: mandatory at Google and Yahoo since 2024 for bulk senders – Souvera Shield checks both header and endpoint.
DNS blacklist
Match of the sending IP against common public blacklists – daily checks and immediate alerting on new listings.
How is your domain's reputation doing? Talk to us.
How it works
An email's journey through Souvera Shield
Arrival
Every incoming mail first passes the upstream security layer – before it ever reaches your mailbox.
Inspection
Spam scoring, virus scanning and content filtering analyze the message and its attachments.
Quarantine
Suspicious messages are withheld – the recipient is notified.
Your decision
Release, delete or permanently allow/block the sender – the control lies with the user.
Control & compliance
Traceable down to the detail
Shield is built for enterprise use: with a clean permission model and complete logging.
Audit log
Every release, deletion and list change is logged chronologically – exportable for compliance purposes.
Central settings
Enable file and virus quarantine per instance, control notifications and spam thresholds centrally.
Role-based permissions
End-user functions and reputation management are cleanly separated via groups – technically enforced on every endpoint.
Encrypted credentials
All connection data is stored encrypted; central API tokens are managed by the credentials hub in Souvera Central.
Security you can understand.
See Shield and the reputation management live in action.