Set headers when sending emails with Cognito

Question

How can I set specific email headers when sending emails through cognito custom emails system?
More precisely I'd like to set the 'X-Entity-Ref-ID' header to avoir threading in recipient inboxes.

CustomMessage lambdas has no header method in the response json
CustomEmailSender could work but feels overkill.

Thanks

Louis Letourneau · Accepted Answer

So the only solution to this problem is to use a CustomEmailSender and add the header in that lambda. A lot more code to write to access SES but more control. A shame, access to settings headers on emails would simplify all this.

Parnab · Answer

With Amazon Cognito, Custom message Lambda trigger, you can only set the following: 
* "smsMessage": "string",
* "emailMessage": "string",
* "emailSubject": "string"

You cannot set the email headers as of now. However using a different subject line may allow you to not group emails from being shown as a threads without using "X-Entity-Ref-ID".

Set headers when sending emails with Cognito

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