How to add on "List-unsubscribe Header" in our email?

I can tell you for sure we're adding the header, so double check in case you have any custom code that might remove this header, or maybe your smtp provider is removing it, so check there as well. As far as we're concerned, we add the header.
 
@twisted1919

We do not have any custom code to this effect

We are using elastic email ... it does not remove the header

Can you please check what is going wrong with our setup?
 
Hi @twisted1919

You are right... It was disabled at Elastic... but this is what they said

Some destination servers see the lack of a list-unsubscribe header as a bad practice and could react negatively to your mail.

What is your opinion?
 
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