Register Ecid May 2026
It sounds like you're referring to a feature for looking up or validating an (Exclusive Chip ID) — likely in the context of Apple devices (iOS, iPhone, iPad, iPod), or possibly another embedded system.
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- Solution home
- Client-side Signatures
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Get Started
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Get Started
- How to setup Signature 365
- Signature 365 system requirements
- Signing up for a Signature 365 account
- Creating a new Signature 365 subscription
- Applying Signatures to users and groups
- Signature 365 SMTP host list and IP whitelist
- Migrating to Signature 365 from Email Signature Manager
- How to use the Signature 365 migration wizard
- What's New?
- Upcoming features
- Signature 365 reliability and security
- Signature 365 development roadmap
- Signature 365 required permissions
- Adding additional Teammates to manage Signature 365
- How to uninstall Signature 365 from your Microsoft 365 tenant
- What types of messages are supported
- Using two-factor authentication with a Signature 365 admin account
- Enabling Single sign-on (SSO) for Signature 365 management accounts
- User Guides
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Service Information
- Do my emails remain private when using Signature 365?
- Does Signature 365 support DomainKeys Identified Mail (DKIM)?
- Does Signature 365 support Azure Active Directory (Azure AD) Dynamic Groups?
- Do you store my Microsoft 365 Global Administrator credentials?
- Is Signature 365 GDPR and CCPA compliant?
- What Entra ID data is synced with Signature 365?
- What is the difference between client-side and server-side signatures?
- Signature 365 Outlook Add-in Manifest versions
- Removing Email Signature Manager following migration to Signature 365
- Signature 365 ports and URLs
- Signature 365 Exchange Mailbox support
- Signature 365 Entra ID Enterprise applications
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Get Started
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Signature 365 Web Portal
- Integration
- Signature Templates
- Designing Templates
- Signature Rules
- Managing Images
- Fields
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Troubleshooting
- How to update the Sender Policy Framework (SPF) record
- Import Active Directory attributes into Signature 365
- Signature 365 domain shows as "Incomplete setup" within Microsoft 365 Admin center
- Role Based Access Control in Signature 365
- Outlook add-in reports "The request has failed...."
- Multi-factor recovery process
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Client-side Signatures
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Deployment and configuration
- How Outlook client-side signatures work
- Version requirements for the Outlook mobile Add-in
- How to install the Outlook add-in
- How to install the Outlook (Classic) agent
- Updating the Signature 365 Outlook add-in
- Managing personal signatures, fonts and stationery for "New" Outlook and Outlook Web Access
- Managing Outlook's default signature options with the Signature 365 Outlook add-in
- How to enable debug log in Outlook add-in
- How to set Outlook default fonts for all users
- Managing personal signatures, fonts and stationary for Classic Outlook desktop
- Enable legacy Exchange Online tokens
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Troubleshooting
- Outlook add-in is not being deployed to users as expected
- Outlook add-in is not adding default signatures to email
- Signature 365 Classic Agent cannot support Microsoft One Outlook
- Outlook Desktop - Images appear as attachments when email is saved as draft
- Supported Outlook versions for Signature 365 client signatures
- Current versions of Signature 365 software
- Signature 365 Outlook Add-in is removed after log out
- Signature images appear as attachments in web mail services
- HTML tags are shown for weblinks and images
- Existing outlook email templates insert signature above email body
- How to enable remote logging in the Outlook Add-in
- Disabling Outlook signatures in New Outlook and OWA
- Creating a security group using dynamic group membership
- Signature 365 agent authentication script error
- Using the Aptos font in Signature 365
- Using S/MIME with Outlook Mobile
- Nested app authentication (NAA) and deprecation of Exchange legacy tokens
- Using the Outlook mobile add-in in GCC environments
- Outlook add-in: Opening the Outlook devtools debug window
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Deployment and configuration
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Server-side Signatures
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Deployment and configuration
- Using Server-side injection to specify the location of an inserted signature
- How Microsoft 365 server-side signatures work
- How to trial Signature 365 when already using another signature service
- How to use Signature 365 together with third-party security solutions
- Exclude Autoreplies from Signature insertion
- Using Signature 365 with read only access to Microsoft 365
- Exclude signatures on Microsoft Planner comment emails
- Create an exclusion group to exclude users from server-side injection
- Recreating the Signature 365 Exchange connectors
- How to update the group assigned for server-side injection
- Tasks, contacts and voting buttons are removed from internal emails sent using Signature 365 server-side signatures
- Using Outlook message recall with Signature 365
- Inserting a signature in a specific location with Server-side injection
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Troubleshooting
- Non-delivery report errors and solutions
- A signature is not applied to emails with large attachments
- Non-delivery report 550 5.4.1 Recipient address rejected: Access denied
- Non-delivery report 550 5.1.8 Access denied, bad outbound sender
- Removing the Signature 365 Mailflow rule and Exchange Connectors
- Enabling server-side injection in Signature 365
- Unable to contact the Signature 365 service when using the Add-in with an on-premise mailbox
- Signature 365 Transport Agent Debug Log File
- Server-side injection - Digital Guardian Agent X-dg headers cause 552 5.3.4 error
- Non-delivery report 552 5.3.4 Header size exceeds fixed maximum size
- Non-delivery report 550 5.7.1 Unable to relay this email
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Deployment and configuration
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Billing
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Frequently Asked Questions
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Frequently Asked Questions
- Apple Mail application replaces images with when replying
- Using Signature 365 in a hybrid configuration with on-premise Exchange mailboxes
- Using Sent Items Update does not work when sending on behalf of another user
- Using a group policy object to disable signatures in Microsoft Outlook
- Outlook (Classic) agent release notes
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Frequently Asked Questions