With this tool, your IIS SMTP Service and Exchange Server will be enabled to add disclaimer with embedded images and digital signature to outgoing emails from specified sender(s) or domain(s). Moreover, email encryption (with using the recipient's digital certificate) and S/MIME (Secure / Multipurpose Internet Mail Extensions) will become fully supported in your Exchange server.
See Also
Using Disclaimer, S/MIME Sink
Email Disclaimer
Digital Signature
Email Encryption
Journal and Troubleshooting
Appendix - Set up DomainKeys/DKIM
Appendix - Set up SPF record in DNS server
Online Tutorials:
Add Disclaimer or Signature with Embedded Images in Exchange Server 2007/2010/2013/2016/2019 - Tutorial
Add Digital Signature (S/MIME) to Email in Exchange Server 2007/2010/2013/2016/2019 - Tutorial
Encrypt Email (S/MIME) in Exchange Server 2007/2010/2013/2016/2019 - Tutorial
Add Disclaimer or Signature with Embedded Images in IIS SMTP Service and Exchange Server 2003 - Tutorial
Add Digital Signature (S/MIME) to Email in IIS SMTP Service and Exchange Server 2003 - Tutorial
Encrypt Email (S/MIME) in IIS SMTP Service and Exchange Server 2003 - Tutorial