# Duplicate List-Unsubscribe Header with Postmark

**URL:** <https://forum.mautic.org/t/duplicate-list-unsubscribe-header-with-postmark/30511>\
**Category:** General Discussion\
**Tags:** community, discussion, email\
**Created:** [January 15, 2024, 8:24pm UTC](https://forum.mautic.org/t/duplicate-list-unsubscribe-header-with-postmark/30511 "2024-01-15T20:24:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![av1dlearner](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/av1dlearner/32/997_2.png) [@av1dlearner](https://forum.mautic.org/u/av1dlearner)\
**Post date:** [January 15, 2024, 8:24pm UTC](https://forum.mautic.org/t/duplicate-list-unsubscribe-header-with-postmark/30511/1 "2024-01-15T20:24:38Z")

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Hello Mautic Community,

I hope you’re all doing well. I’m using postmark SMTP on 5.0.1 currently facing an issue that Postmark is automatically injecting a List-Unsubscribe header on marketing streams, while mautic is also automatically including one, resulting in duplicate headers. I’m unsure if this could potentially cause problems, but my concern is that email clients may not know where to send the traffic.

Has anyone else encountered a similar situation or can provide guidance on how to address this issue effectively? I appreciate any insights, suggestions, or experiences you can share regarding handling duplicate headers when using Postmark in conjunction with Mautic.

(I would envision something like a “Include `List-Unsubscribe` header?” checkbox in email configuration)

Thank you in advance for your assistance!

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**Author:** ![silavapi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silavapi/32/7424_2.png) [@silavapi](https://forum.mautic.org/u/silavapi)\
**Post date:** [January 16, 2024, 9:55am UTC](https://forum.mautic.org/t/duplicate-list-unsubscribe-header-with-postmark/30511/2 "2024-01-16T09:55:03Z")

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You can write to Postmark, per the guidance on their docs:

> **[How to add an unsubscribe link | Postmark Support Center](https://postmarkapp.com/support/article/1208-how-to-add-an-unsubscribe-link)**
>
> Every message sent through a Broadcast Message Stream in Postmark is required to have an unsubscribe link. Unsubscribe links will also work for messages…

> ## Using your own unsubscribe process
> 
> We understand that some customers have an existing unsubscribe processes that would create duplicate unsubscribes. If you’d like to not use Postmark’s unsubscribes links, [please get in touch](https://postmarkapp.com/contact?topic=streams) to tell us more about how you’re managing unsubscribes.