The most trusted email signature software for Exchange Server
CodeTwo
Email Signatures On-prem
- Centrally managed email signatures, disclaimers, marketing banners and email flow control
- Support for all email clients, including Outlook and mobiles
- 100% on-prem solution (installed locally; no cloud agents)
- The only on-prem signature & mail flow manager for Exchange SE

Email unsubscribe mechanism for Exchange Server
Many anti-spam regulations, such as CASL, CAN-SPAM, the ePrivacy Directive, or Australia’s Spam Act 2003, require organizations to deploy an email unsubscribe mechanism that would allow users to easily opt-out from receiving further correspondence. Although this functionality is already a standard in marketing and mass mailing systems, Exchange Server lacks this feature natively.
CodeTwo Email Signatures On-prem is an advanced Exchange Server application based on a transport agent architecture. It adds many useful administrative features to Exchange, covering such aspects as mail flow control, email signatures and disclaimers management, attachment control, DLP, and email forwarding options. Most importantly, the program provides a complete email unsubscribe mechanism for Exchange Server that will let you comply with anti-spam regulations in Canada and many other countries.
CodeTwo Email Signatures On-prem lets you:
- Automatically add an unsubscribe link to all or selected emails.
- Create and maintain server-side lists of unsubscribed email addresses.
- Block messages sent to unsubscribed recipients.
- Import/export lists of unsubscribed email addresses.
- Integrate with a mass mailing system’s unsubscribe mechanism used by your marketing department.
Download free trial
no credit card required; free support while you test
Download free trial
no credit card required;
free support while you test
About anti-spam regulations
Various anti-spam regulations around the world, such as Canada’s CASL, the U.S. CAN-SPAM Act, the EU’s ePrivacy Directive, or the UK’s PECR, establish specific requirements for sending commercial emails. To stay compliant with these regulations, if your company or organization sends out commercial emails, you need to make sure you have fulfilled three main requirements:
- Obtain express or written consent from the message addressee to receive commercial emails from your company or organization.
- Clearly identify yourself in the message.
- Provide an unsubscribe link in the message for users who want to stop receiving further emails from you and your organization in the future.
Failing to meet these requirements may result in significant penalties. For example, under CASL, fines can reach up to C$1 million for individuals and C$10 million for businesses.
See also: Canada’s strict anti-spam law (CASL) vs your email marketing
How can CodeTwo Email Signatures On-prem help?
If your company uses Microsoft Exchange Server SE, CodeTwo Email Signatures On-prem can help you stay in compliance with many anti-spam regulations.
The program needs to be installed directly on the mail server with Microsoft Exchange onboard. Once configured properly, CodeTwo Email Signatures On-prem adds a complete set of features to Microsoft Exchange, including the email unsubscribe mechanism required by CAN-SPAM Act, CASL and similar acts.
If specific email rules are set, every email sent outside your organization will be stamped with a disclaimer containing an unsubscribe link. Once this link is clicked, the recipient’s email address will be added to a blacklist on your email server’s side. After that, whenever anyone from your company tries to send another message to this person, this message will be blocked.
Learn more about the unsubscribe mechanism in CodeTwo Email Signatures On-prem



