Exchange Checker Tool
Test Exchange Autodiscover, EWS, and SMTP connectivity
This page provides original, human-reviewed information about detecting Microsoft Exchange and Microsoft 365 mail environments, explaining autodiscover hints, MX patterns, and what the results mean for migration and integration projects.
Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems and provides email, calendar, contacts, and task management capabilities.
Key Exchange Services:
- Autodiscover:Automatically configures email clients with server settings
- Exchange Web Services (EWS):API for accessing Exchange data programmatically
- SMTP/IMAP/POP3:Standard email protocols for sending and receiving messages
- ActiveSync:Mobile device synchronization protocol
Exchange Deployment Types:
On-Premises Exchange
Self-hosted Exchange servers managed by your organization
Exchange Online (Office 365)
Cloud-hosted Exchange service managed by Microsoft
Autodiscover is a service that automatically provides configuration information to email clients. It eliminates the need for users to manually configure server settings in their email applications.
How Autodiscover Works:
- Email client extracts domain from user's email address
- Client attempts to connect to various Autodiscover URLs
- Server responds with XML configuration data
- Client automatically configures email settings
Common Autodiscover URLs:
Exchange Web Services (EWS) is a web service API that enables applications to access Exchange server data. It provides programmatic access to email, calendar, contacts, and tasks.
EWS Capabilities:
- Send, receive, and manage email messages
- Access and modify calendar appointments
- Manage contacts and distribution lists
- Handle tasks and to-do items
- Access public folders and shared mailboxes
EWS Endpoint Examples:
Exchange Online
On-Premises Exchange
Autodiscover Failures
Autodiscover service not responding or returning incorrect configuration.
Solutions:
- Verify DNS records for autodiscover.domain.com
- Check SSL certificate validity
- Ensure IIS and Exchange services are running
- Review Exchange virtual directory settings
EWS Connection Issues
Unable to connect to Exchange Web Services endpoint.
Solutions:
- Verify EWS virtual directory is enabled
- Check authentication methods (Basic, NTLM, OAuth)
- Ensure proper firewall and proxy configuration
- Test with Exchange Remote Connectivity Analyzer
SMTP Authentication Problems
SMTP server rejecting authentication or connection attempts.
Solutions:
- Verify SMTP authentication is enabled
- Check TLS/SSL configuration
- Ensure correct port usage (587 for submission, 25 for relay)
- Review Exchange receive connector settings
Certificate Issues
SSL/TLS certificate problems affecting secure connections.
Solutions:
- Ensure certificate includes all required SANs
- Verify certificate is not expired
- Check certificate chain and root CA trust
- Assign certificate to Exchange services
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