---
type: concept
title: Outlook Signature Verification
tags: [email-security, smime, verification, phishing-prevention]
related: [outlook-smime-usage, smime, e-mail-sicherheit, phishing-prevention]
created: 2026-06-30
updated: 2026-06-30
sources: ["output/rz_uni_greifswald_de_dienste_allgemein_e_mail_e_mail_sicherheit_e_mail_echtheit_.md"]
---

# Outlook Signature Verification

Outlook Signature Verification is the process of confirming the authenticity and integrity of a received email using digital signatures, typically implemented via [[smime]]. This process is a critical component of [[e-mail-sicherheit]] and serves as a primary defense mechanism for [[phishing-prevention]] by mitigating email spoofing.

## Verification Criteria
In Microsoft Outlook, an email is considered authentic if the following two conditions are met:
1. **Visual Indicator**: A specific "seal" (Siegel) icon is present on the email.
2. **Sender Validation**: The sender's email address is correct and matches the expected identity.

## Inspection Workflow
Users can verify the details of the signature through two levels of inspection:
- **Basic Information**: Clicking the seal icon displays summary information about the digital signature.
- **Full Certificate Details**: Clicking the **Details** button provides access to the complete digital certificate, allowing the user to verify the issuer and the identity of the signer.

## Version Note
Documentation for this process (specifically from source `6-output--66-rzunigreifswalddediensteallgemeinemailemailsicherheitemailechtheit--14cqiwt`) references Outlook 2010. Users of modern Outlook LTSC versions should verify if the UI elements (such as the seal icon) have changed, although the underlying S/MIME verification logic remains consistent.
