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Apologies, unfortunately, we do not have an integration with Mailrelay. However, let me forward this to our developers as a feature request, so that they can count you in our list of users looking for this feature. Please note that we cannot guarantee that this will be implemented, it depends on the current workload of our developers and the feasibility of the actual integration. But rest assure that we will update you on this thread as soon as we hear any news.
If I may suggest, you could check the list of apps and integrations that we have related to email marketing on these pages: