Send an email in resend and add it to a sequence.

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We are sending out emails to customers, and we would like to follow up after 3-5 days in case they have not responded yet. We are thinking about using an external sequencer for these kinds of follow-up emails, but the initial email will be sent by Resend.

My question would be how I could do this in Resend without too much custom logic and implementation logic. If I want to outsource this to a scheduler, I will be having a hard time sending the follow up in the same thread to the customer who received the initial email.

The initial email by Resend is not really a marketing email; it's an RFQ that the customer requested. The email is highly specialized and designed in a certain way that I cannot just send it via a sequencer without any proper HTML formatting. The follow-up emails will be plain HTML and pretty simple but it would be important to keep them in the same thread to not start a new conversation with the customer.

Has anyone implemented this?