SmartRelay enables you to create and deliver transactional messages or bulk campaigns, while:

  • Realizing the benefits of using a professionally managed email service provider (ESP) platform
  • Retaining the advantages of a simple and standard SMTP interface


  • Allows messages to be relayed through an SMTP connection
  • Automatically re-wraps messages injected into the SMTP connection
    • Enables the delivery-related aspects of SMTP and MIME to be managed by Contactlab
  • Works as a gateway between your email message-generating applications and the recipients
    • Messages for delivery are communicated through a dedicated SMTP listener
  • Supports outbound SMS messages by converting appropriately configured email messages

Using this guide

These pages provide the following information:

At the bottom of each page are:

  • Related Pages linksLinks to associated pages in the same section of the manual, as well as to other section title pages.
  • Also see linksLinks to other relevant topics in this guide.
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The Related Pages section of this page is a Table of Contents for all pages in this guide. It can be used to quickly find any information you may need. The table of contents also includes links to all pages.


The online user guide is always the most up-to-date version. If you have any questions about this document or SmartRelay, please get in touch with your usual contact at Contactlab, such as your project manager, account manager or Contactlab customer care.

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Understanding SmartRelay